Public water system profile

Town of Castle Rock

Explore available public water records for Town of Castle Rock (PWSID CO0118010). Find annual reports, results listed in those reports, official sources, and clear notes about what the records can and cannot show. This page does not show conditions at a specific tap.

View report rows

System Snapshot

Available system-level context

This snapshot shows the identity and context fields currently available for Town of Castle Rock (PWSID CO0118010). Read it with the source links and limitations below.

Last updated: Data reviewed:

System identity

PWSID
CO0118010
State
Colorado
Linked communities
Castle Rock
County context
Not listed in current record
System type
Community water system
Source water
Groundwater, alluvial wells, surface diversions, and WISE water
Population served context
Not listed in current record
Service connections
Not listed in current record
Latest reviewed report
2026 report link found
Data updated
2026-06-11

A source-backed population-served value is not currently shown for this system. City population should not be used as a substitute for the public water system population.

Read these as system-level fields from reviewed public records. Confirm provider and address-specific questions with official utility, city, state, or EPA sources.

Report-Listed Rows

Report-listed rows summarized from the latest reviewed report

30 report-listed rows are summarized for Town of Castle Rock. A listed row is not the same thing as a current advisory or household tap result.

Report year
2026
Rows summarized
30
Source tables represented
8
Scope
Past reporting period
Report-row preview from the latest reviewed report for Town of Castle Rock
Substance and testing periodReported valueRange in reportLimit or standardSource tableReport-printed status
ChloramineTesting period: December 2025100% %Lowest period of samples meeting TT requirementNot listed in this summarized entryNot listed in this summarized entryDisinfectants Sampled in the Distribution SystemPage 8Typical source, as printed: Water additive used to control microbesTT Violation: No, as printed for this sample period
Total Haloacetic Acids (HAA5)Testing period: 20252.09 ppbAverageRange Low to High: 0 to 5.56MCL: 60; MCLG: N/ADisinfection Byproducts Sampled in the Distribution SystemPage 9Typical source, as printed: Byproduct of drinking water disinfectionMCL Violation: No, as printed for this sample period
Total Trihalomethanes (TTHM)Testing period: 20256.18 ppbAverageRange Low to High: 1.5 to 13.3MCL: 80; MCLG: N/ADisinfection Byproducts Sampled in the Distribution SystemPage 9Typical source, as printed: Byproduct of drinking water disinfectionMCL Violation: No, as printed for this sample period
BromateTesting period: 20252.46 ppbAverageRange Low to High: 0 to 5.6MCL: 10; MCLG: 0Disinfection Byproducts Sampled at the Entry Point to the Distribution SystemPage 9Typical source, as printed: Byproduct of drinking water disinfectionMCL Violation: No, as printed for this sample period
TurbidityTesting period: May 20250.038 NTU NTUHighest single measurementNot listed in this summarized entryNot listed in this summarized entrySummary of Turbidity Sampled at the Entry Point to the Distribution SystemPage 9Typical source, as printed: Soil RunoffTT Violation: No, as printed for this sample period
TurbidityTesting period: December 2025100% %Lowest monthly percentage of samples meeting TT requirement for our technologyNot listed in this summarized entryNot listed in this summarized entrySummary of Turbidity Sampled at the Entry Point to the Distribution SystemPage 9Typical source, as printed: Soil RunoffTT Violation: No, as printed for this sample period
Alkalinity (CaCO3)Testing period: 202599 ppmAverageRange Low – High: 89 to 124Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 35; Secondary Standard: N/A.
ChlorideTesting period: 202537 ppmAverageRange Low – High: 16 to 115Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 35; Secondary Standard: 250.
Hardness (CaCO3)Testing period: 2025100 ppmAverageRange Low – High: 61 to 182Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 37; Secondary Standard: N/A.
pHTesting period: 20258.10 SUAverageRange Low – High: 6.9 to 8.8Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 73; Secondary Standard: 6.5 to 8.5.
SodiumTesting period: 202533.75 ppmAverageRange Low – High: 11.4 to 69Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 11; Secondary Standard: N/A.
SulfateTesting period: 202527 ppmAverageRange Low – High: 13 to 54Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 38; Secondary Standard: 250.
Total Dissolved Solids (TDS)Testing period: 2025229 ppmAverageRange Low – High: 166 to 500Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 73; Secondary Standard: 500.
Total IronTesting period: 20250.003 ppmAverageRange Low – High: 0 to 0.05Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 73; Secondary Standard: 0.3.
Total ManganeseTesting period: 20250.011 ppmAverageRange Low – High: 0.006 to 0.02Not listed in this summarized entrySecondary ContaminantsPage 10Sample Size: 38; Secondary Standard: 0.05.
ArsenicTesting period: 20250.64 ppbAverageRange Low to High: 0 to 3MCL: 10; MCLG: 0Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastesMCL Violation: No, as printed for this sample period
BariumTesting period: 20250.12 ppmAverageRange Low to High: 0.08 to 0.2MCL: 2; MCLG: 2Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Discharge of drilling wastes; discharge from metal refineries; erosion of natural depositsMCL Violation: No, as printed for this sample period
ChromiumTesting period: 20252.09 ppbAverageRange Low to High: 1 to 4MCL: 100; MCLG: 100Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Discharge from steel and pulp mills; erosion of natural depositsMCL Violation: No, as printed for this sample period
FluorideTesting period: 20250.74 ppmAverageRange Low to High: 0.62 to 0.95MCL: 4; MCLG: 4Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Erosion of natural deposits (all natural in Castle Rock); water additive (not added in Castle Rock) which promotes strong teeth; discharge from fertilizer and aluminum factoriesMCL Violation: No, as printed for this sample period
NitrateTesting period: 20250.33 ppmAverageRange Low to High: 0 to 1.5MCL: 10; MCLG: 10Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural depositsMCL Violation: No, as printed for this sample period
Nitrate-NitriteTesting period: 20250.43 ppmAverageRange Low to High: 0.2 to 0.8MCL: 10; MCLG: 10Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural depositsMCL Violation: No, as printed for this sample period
SeleniumTesting period: 20252.36 ppbAverageRange Low to High: 0 to 4MCL: 50; MCLG: 50Inorganic Contaminants Sampled at the Entry Point to the Distribution SystemPage 10Typical source, as printed: Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from minesMCL Violation: No, as printed for this sample period
CopperTesting period: 03/31/25 to 06/17/25Sites above action level00.15 ppm90th PercentileTap Sample Range Low-High: 0.012 to 0.28Action level: 1.3; MCLG: not listedLead and Copper Sampled in the Distribution SystemPage 11Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits90th Percentile AL Exceedance: No, as printed for this sample period
LeadTesting period: 03/31/2025 to 06/17/2025Sites above action level02 ppb90th PercentileTap Sample Range Low-High: 0 to 11Action level: 15; MCLG: not listedLead and Copper Sampled in the Distribution SystemPage 11Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits90th Percentile AL Exceedance: No, as printed for this sample period
CopperTesting period: 10/20/2025 to 12/17/2025Sites above action level00.16 ppm90th PercentileTap Sample Range Low-High: 0 to 0.484Action level: 1.3; MCLG: not listedLead and Copper Sampled in the Distribution SystemPage 11Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits90th Percentile AL Exceedance: No, as printed for this sample period
LeadTesting period: 10/20/2025 to 12/17/2025Sites above action level12 ppb90th PercentileTap Sample Range Low-High: 0 to 17Action level: 15; MCLG: not listedLead and Copper Sampled in the Distribution SystemPage 11Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits90th Percentile AL Exceedance: No, as printed for this sample period
Gross AlphaTesting period: 20252.6 pCi/LAverageRange Low to High: 0.89 to 6.6MCL: 15; MCLG: 0Radionuclides Sampled at the Entry Point to the Distribution SystemPage 11Typical source, as printed: Erosion of natural depositsMCL Violation: No, as printed for this sample period
Combined RadiumTesting period: 20252.52 pCi/LAverageRange Low to High: 0.5 to 4.1MCL: 5; MCLG: 0Radionuclides Sampled at the Entry Point to the Distribution SystemPage 11Typical source, as printed: Erosion of natural depositsMCL Violation: No, as printed for this sample period
Combined UraniumTesting period: 20250.23 ppbAverageRange Low to High: 0 to 0.55MCL: 30; MCLG: 0Radionuclides Sampled at the Entry Point to the Distribution SystemPage 11Typical source, as printed: Erosion of natural depositsMCL Violation: No, as printed for this sample period
Gross Beta Particle ActivityTesting period: 20257.09 pCi/L*AverageRange Low to High: 3.7 to 11MCL: 50; MCLG: 0Radionuclides Sampled at the Entry Point to the Distribution SystemPage 11Typical source, as printed: Decay of natural and man-made depositsMCL Violation: No, as printed for this sample period

Report row

Chloramine

Range in report
Not listed in this summarized entry
Lowest period of samples meeting TT requirement
100% %
Testing period
December 2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
TT Violation: No, as printed for this sample period

Source · Page 8

Disinfectants Sampled in the Distribution System

Typical source, as printed: Water additive used to control microbes

Report row

Total Haloacetic Acids (HAA5)

Range in report
Range Low to High: 0 to 5.56 ppb
Average
2.09 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 60; MCLG: N/A
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 9

Disinfection Byproducts Sampled in the Distribution System

Typical source, as printed: Byproduct of drinking water disinfection

Report row

Total Trihalomethanes (TTHM)

Range in report
Range Low to High: 1.5 to 13.3 ppb
Average
6.18 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 80; MCLG: N/A
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 9

Disinfection Byproducts Sampled in the Distribution System

Typical source, as printed: Byproduct of drinking water disinfection

Report row

Bromate

Range in report
Range Low to High: 0 to 5.6 ppb
Average
2.46 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 10; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 9

Disinfection Byproducts Sampled at the Entry Point to the Distribution System

Typical source, as printed: Byproduct of drinking water disinfection

Report row

Turbidity

Range in report
Not listed in this summarized entry
Highest single measurement
0.038 NTU NTU
Testing period
May 2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
TT Violation: No, as printed for this sample period

Source · Page 9

Summary of Turbidity Sampled at the Entry Point to the Distribution System

Typical source, as printed: Soil Runoff

Report row

Turbidity

Range in report
Not listed in this summarized entry
Lowest monthly percentage of samples meeting TT requirement for our technology
100% %
Testing period
December 2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
TT Violation: No, as printed for this sample period

Source · Page 9

Summary of Turbidity Sampled at the Entry Point to the Distribution System

Typical source, as printed: Soil Runoff

Report row

Alkalinity (CaCO3)

Range in report
Range Low – High: 89 to 124 ppm
Average
99 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 35; Secondary Standard: N/A.

Source · Page 10

Secondary Contaminants

Report row

Chloride

Range in report
Range Low – High: 16 to 115 ppm
Average
37 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 35; Secondary Standard: 250.

Source · Page 10

Secondary Contaminants

Report row

Hardness (CaCO3)

Range in report
Range Low – High: 61 to 182 ppm
Average
100 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 37; Secondary Standard: N/A.

Source · Page 10

Secondary Contaminants

Report row

pH

Range in report
Range Low – High: 6.9 to 8.8 SU
Average
8.10 SU
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 73; Secondary Standard: 6.5 to 8.5.

Source · Page 10

Secondary Contaminants

Report row

Sodium

Range in report
Range Low – High: 11.4 to 69 ppm
Average
33.75 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 11; Secondary Standard: N/A.

Source · Page 10

Secondary Contaminants

Report row

Sulfate

Range in report
Range Low – High: 13 to 54 ppm
Average
27 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 38; Secondary Standard: 250.

Source · Page 10

Secondary Contaminants

Report row

Total Dissolved Solids (TDS)

Range in report
Range Low – High: 166 to 500 ppm
Average
229 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 73; Secondary Standard: 500.

Source · Page 10

Secondary Contaminants

Report row

Total Iron

Range in report
Range Low – High: 0 to 0.05 ppm
Average
0.003 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 73; Secondary Standard: 0.3.

Source · Page 10

Secondary Contaminants

Report row

Total Manganese

Range in report
Range Low – High: 0.006 to 0.02 ppm
Average
0.011 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
Not listed in this summarized entry
Report-printed status
Sample Size: 38; Secondary Standard: 0.05.

Source · Page 10

Secondary Contaminants

Report row

Arsenic

Range in report
Range Low to High: 0 to 3 ppb
Average
0.64 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 10; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes

Report row

Barium

Range in report
Range Low to High: 0.08 to 0.2 ppm
Average
0.12 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 2; MCLG: 2
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits

Report row

Chromium

Range in report
Range Low to High: 1 to 4 ppb
Average
2.09 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 100; MCLG: 100
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Discharge from steel and pulp mills; erosion of natural deposits

Report row

Fluoride

Range in report
Range Low to High: 0.62 to 0.95 ppm
Average
0.74 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 4; MCLG: 4
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Erosion of natural deposits (all natural in Castle Rock); water additive (not added in Castle Rock) which promotes strong teeth; discharge from fertilizer and aluminum factories

Report row

Nitrate

Range in report
Range Low to High: 0 to 1.5 ppm
Average
0.33 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 10; MCLG: 10
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits

Report row

Nitrate-Nitrite

Range in report
Range Low to High: 0.2 to 0.8 ppm
Average
0.43 ppm
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 10; MCLG: 10
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits

Report row

Selenium

Range in report
Range Low to High: 0 to 4 ppb
Average
2.36 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 50; MCLG: 50
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 10

Inorganic Contaminants Sampled at the Entry Point to the Distribution System

Typical source, as printed: Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines

Report row

Copper

Range in report
Tap Sample Range Low-High: 0.012 to 0.28 ppm
90th Percentile
0.15 ppm
Testing period
03/31/25 to 06/17/25
Sites above action level
0
Limit or standard
Action level: 1.3; MCLG: not listed
Report-printed status
90th Percentile AL Exceedance: No, as printed for this sample period

Source · Page 11

Lead and Copper Sampled in the Distribution System

Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits

Report row

Lead

Range in report
Tap Sample Range Low-High: 0 to 11 ppb
90th Percentile
2 ppb
Testing period
03/31/2025 to 06/17/2025
Sites above action level
0
Limit or standard
Action level: 15; MCLG: not listed
Report-printed status
90th Percentile AL Exceedance: No, as printed for this sample period

Source · Page 11

Lead and Copper Sampled in the Distribution System

Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits

Report row

Copper

Range in report
Tap Sample Range Low-High: 0 to 0.484 ppm
90th Percentile
0.16 ppm
Testing period
10/20/2025 to 12/17/2025
Sites above action level
0
Limit or standard
Action level: 1.3; MCLG: not listed
Report-printed status
90th Percentile AL Exceedance: No, as printed for this sample period

Source · Page 11

Lead and Copper Sampled in the Distribution System

Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits

Report row

Lead

Range in report
Tap Sample Range Low-High: 0 to 17 ppb
90th Percentile
2 ppb
Testing period
10/20/2025 to 12/17/2025
Sites above action level
1
Limit or standard
Action level: 15; MCLG: not listed
Report-printed status
90th Percentile AL Exceedance: No, as printed for this sample period

Source · Page 11

Lead and Copper Sampled in the Distribution System

Typical source, as printed: Corrosion of household plumbing systems; Erosion of natural deposits

Report row

Gross Alpha

Range in report
Range Low to High: 0.89 to 6.6 pCi/L
Average
2.6 pCi/L
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 15; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 11

Radionuclides Sampled at the Entry Point to the Distribution System

Typical source, as printed: Erosion of natural deposits

Report row

Combined Radium

Range in report
Range Low to High: 0.5 to 4.1 pCi/L
Average
2.52 pCi/L
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 5; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 11

Radionuclides Sampled at the Entry Point to the Distribution System

Typical source, as printed: Erosion of natural deposits

Report row

Combined Uranium

Range in report
Range Low to High: 0 to 0.55 ppb
Average
0.23 ppb
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 30; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 11

Radionuclides Sampled at the Entry Point to the Distribution System

Typical source, as printed: Erosion of natural deposits

Report row

Gross Beta Particle Activity

Range in report
Range Low to High: 3.7 to 11 pCi/L*
Average
7.09 pCi/L*
Testing period
2025
Sites above action level
Not applicable to this summarized entry
Limit or standard
MCL: 50; MCLG: 0
Report-printed status
MCL Violation: No, as printed for this sample period

Source · Page 11

Radionuclides Sampled at the Entry Point to the Distribution System

Typical source, as printed: Decay of natural and man-made deposits

Source report notes

Source: Castle Rock 2026 Water Quality Report. Retrieved 2026-08-13.

  • Applies to: Chloramine, Total Haloacetic Acids (HAA5), Total Trihalomethanes (TTHM), Bromate, Turbidity, Alkalinity (CaCO3), Chloride, Hardness (CaCO3), pH, Sodium, Sulfate, Total Dissolved Solids (TDS), Total Iron, Total Manganese, Arsenic, Barium, Chromium, Fluoride, Nitrate, Nitrate-Nitrite, Selenium, Copper, Lead, Gross Alpha, Combined Radium, Combined Uranium, Gross Beta Particle Activity

    Source-printed values are preserved without inferring current status, compliance, water safety, or household conditions.

Review the linked source report for definitions, footnotes, and official wording.

Violation Records

Violation records shown on this page

This section shows 0 system-scoped violation detail records currently included for Town of Castle Rock. Annual reports and current notices can use different timing and terminology.

No system-scoped violation detail records are included in the available reviewed records for this system. This is not an official compliance finding. Check the official utility, state, or EPA source for current compliance and notice information.

Source notes for this system mention violation-related context, but this page does not currently display separate system-scoped violation detail records.

Important limitation

Profile summary note

This page summarizes public records reviewed by this site. It does not replace official notices, utility updates, or state drinking water information.

System profile limitations

  • This record is based on official Castle Rock Water sources reviewed on June 11, 2026.
  • The town also publishes separate Bell Mountain Ranch reports; this record uses the main Castle Rock report only.
  • Population served is omitted until a current source-backed public-water-system inventory value is listed.
  • Address-level service can vary. Confirm the serving provider with a bill, account portal, utility, city, or state source.
  • This page may show summarized entries from available annual reports. It does not include a complete historical contaminant table.
  • This page shows summarized entries from the available report. It does not include a complete contaminant or violation table.
  • Missing fields are not findings. They mean the field is not shown on this page from the records currently available.
  • This page summarizes available public records. It may not include every update, notice, or urgent official advisory.

Latest Reviewed Report

Latest reviewed report found by this site

The 2026 report found for Town of Castle Rock summarizes a past reporting period. It is not a live alert page.

Utility reportReport data updated:

2026 Water Quality Report

Open 2026 water quality report

The 2026 report link is available for Town of Castle Rock. Use the linked source report for the full table, definitions, footnotes, and official context. This page includes summarized entries from the available report. They are not a complete copy of the report table.

Report year
2026
Summarized entries shown
30
Source name
Castle Rock 2026 Water Quality Report
Source URL
Open report source
Source retrieved
2026-08-13
Last reviewed
2026-08-13

Use the linked source report for the full table, definitions, footnotes, and official context.

Data coverage

This page summarizes selected public records for this public water system. It may not include every report, update, current notice, or address-level service detail.

Latest reviewed report
2026 report link found
Report-listed rows
30 summarized report entries shown
Detailed violation records
No detailed system-scoped records displayed
Population served
Not listed in current record
Service connections
Not listed in current record
City context
Castle Rock
County context
Not listed in current record

Local Context

City and state context for this system

Town of Castle Rock is linked here to Castle Rock for navigation. That relationship does not confirm the provider for a specific address; use a bill, utility portal, or official lookup source.

Linked local context

Linked communities
Castle Rock
County context
Not listed in current record
State context
Colorado

Related Explainers

Related contaminants and guides

Use these explainers with Town of Castle Rock's report year, source table, and official report. Links are limited to existing guide and contaminant pages.

Metals and inorganic chemicals

Nitrate

Nitrate is a regulated inorganic contaminant. Report labels often specify that the result is measured as nitrogen, and that basis must remain attached to the value and unit.

Read the Nitrate contaminant guide

How to look up your drinking water system

Start with a utility bill, PWSID, state lookup tool, or official report so you can find the public water system behind a city or provider name.

View How to look up your drinking water system

How to read a water quality report

A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.

View How to read a water quality report

Corrections

Suggest a correction or newer source

If you have a newer official report, utility source, or correction, send the source link for review. This helps keep profile summaries tied to public records.

Suggest an update

Evidence

Official sources and report links

Use official federal, state, utility, or report sources before treating a page as final.

Data methodology

Review source hierarchy, missing-data handling, and record limitations.

View Data methodology

Data limitations

See why limited records, missing fields, and current notices need careful interpretation.

View Data limitations