System Snapshot
Available system-level context
This snapshot shows the identity and context fields currently available for City of Longmont (PWSID CO0107485). Read it with the source links and limitations below.
System identity
- PWSID
- CO0107485
- State
- Colorado
- Linked communities
- Longmont
- County context
- Not listed in current record
- System type
- Community water system
- Source water
- Surface water from the St. Vrain Creek Watershed and Upper Colorado River Watershed
- Population served context
- Not listed in current record
- Service connections
- Not listed in current record
- Latest reviewed report
- 2025 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
2 report-listed rows are summarized for City of Longmont. A listed row is not the same thing as a current advisory or household tap result.
- Report year
- 2025
- Rows summarized
- 2
- Source tables represented
- 1
- Scope
- Past reporting period
| Substance and testing period | Reported value | Range in report | Limit or standard | Source table | Report-printed status |
|---|---|---|---|---|---|
| BariumTesting period: 2020 | 0.01 ppm ppmResults | Not listed in this summarized entry | MCL: 2 ppm; MCLG: 2 ppm | TABLE I - DRINKING WATER QUALITY: REGULATED CONTAMINANTS - Inorganic and PhysicalPage 8Typical source, as printed: Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits | Source table has no violation or compliance column. |
| Nitrate (NO₃)Testing period: 2025 | <0.10 ppm, Not Detected (ND) ppmResults | Not listed in this summarized entry | MCL: 10 ppm; MCLG: 10 ppm | TABLE I - DRINKING WATER QUALITY: REGULATED CONTAMINANTS - Inorganic and PhysicalPage 8Typical source, as printed: Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits | Source table has no violation or compliance column. |
Report row
Barium
- Range in report
- Not listed in this summarized entry
- Results
- 0.01 ppm ppm
- Testing period
- 2020
- Sites above action level
- Not applicable to this summarized entry
- Limit or standard
- MCL: 2 ppm; MCLG: 2 ppm
- Report-printed status
- Source table has no violation or compliance column.
Report row
Nitrate (NO₃)
- Range in report
- Not listed in this summarized entry
- Results
- <0.10 ppm, Not Detected (ND) ppm
- Testing period
- 2025
- Sites above action level
- Not applicable to this summarized entry
- Limit or standard
- MCL: 10 ppm; MCLG: 10 ppm
- Report-printed status
- Source table has no violation or compliance column.
Source report notes
Source: City of Longmont 2025 Water Quality Report. Retrieved 2026-06-11.
- Applies to: Barium, Nitrate (NO₃)
Source-printed labels, values, ranges, units, criteria, parentheses, and nearby footnotes are preserved as historical annual-report evidence. The table does not print a separate violation column.
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 City of Longmont. 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 City of Longmont drinking-water sources reviewed on June 11, 2026.
- 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 profile is not a complete copy of the annual report or violation records. Use the linked official sources for their full tables and context.
- 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 2025 report found for City of Longmont summarizes a past reporting period. It is not a live alert page.
2025 Water Quality Report
Open 2025 water quality report (opens in a new tab)The 2025 report link is available for City of Longmont. 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
- 2025
- Summarized entries shown
- 2
- Source name
- City of Longmont 2025 Water Quality Report
- Source URL
- Open report source
- Source retrieved
- 2026-06-11
- Last reviewed
- 2026-08-15
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
- 2025 report link found
- Report-listed rows
- 2 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
- Longmont
- County context
- Not listed in current record
Local Context
City and state context for this system
City of Longmont is linked here to Longmont 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
- Longmont
- County context
- Not listed in current record
- State context
- Colorado
Browse related context
County context is shown as a field when it appears in the current record. County pages are not currently available on this site.
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 updateEvidence
Official sources and report links
Use official federal, state, utility, or report sources before treating a page as final.
Utility report
Data methodology
Review source hierarchy, missing-data handling, and record limitations.
View Data methodologyData limitations
See why limited records, missing fields, and current notices need careful interpretation.
View Data limitations