Report identity and source
- Public water system
- City of Lafayette
- PWSID
- CO0107473
- Report year
- 2025
- Official publisher/source
- Lafayette City of 2025 Drinking Water Quality Report
- Source retrieved
- 2026-08-15
- Last reviewed
- 2026-08-15
Reviewed Report Rows
15 reviewed rows from the 2025 report
Measurements, ranges, units, limit fields, status cells, likely-source wording, and table names remain scoped to the named annual-report rows.
Disinfectants Sampled in the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Chlorine | RESULTS: Lowest period percentage of samples meeting TT requirement: 100% | Number of samples below level: 0; sample size: 40 | Dec 2024 | ppm | TT Requirement: At least 95% of samples per period (month or quarter) must be at least 0.2 ppm OR if sample size is less than 40 no more than 1 sample is below 0.2 ppm; MRDL: 4.0 ppm | TT VIOLATION: No (row sample period) | 6 | Disinfectants Sampled in the Distribution System |
Report rowChlorine
Reported measurementRESULTS: Lowest period percentage of samples meeting TT requirement: 100%
Range in reportNumber of samples below level: 0; sample size: 40
Testing period in reportDec 2024
Unitppm
Limit or standard fieldTT Requirement: At least 95% of samples per period (month or quarter) must be at least 0.2 ppm OR if sample size is less than 40 no more than 1 sample is below 0.2 ppm; MRDL: 4.0 ppm
Status printed for this rowTT VIOLATION: No (row sample period)
Source page6
Source tableDisinfectants Sampled in the Distribution System
Lead and Copper Sampled in the Distribution System
| Report row | Reported measurement | Range in report | Sites above action level | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|---|
| Copper | 90TH PERCENTILE: 0.02 | TAP SAMPLE RANGE (LOW-HIGH): 0.005 to 0.034 | 0 | 06/04/2024 to 07/10/2024 | ppm | 90TH PERCENTILE AL: 1.3 | 90TH PERCENTILE AL EXCEEDANCE: No (row sample period) | 7 | Lead and Copper Sampled in the Distribution System |
| Lead | 90TH PERCENTILE: 2 | TAP SAMPLE RANGE (LOW-HIGH): 0 to 15 | 0 | 06/04/2024 to 07/10/2024 | ppb | 90TH PERCENTILE AL: 15 | 90TH PERCENTILE AL EXCEEDANCE: No (row sample period) | 7 | Lead and Copper Sampled in the Distribution System |
Report rowCopper
Reported measurement90TH PERCENTILE: 0.02
Range in reportTAP SAMPLE RANGE (LOW-HIGH): 0.005 to 0.034
Sites above action level0
Testing period in report06/04/2024 to 07/10/2024
Unitppm
Limit or standard field90TH PERCENTILE AL: 1.3
Status printed for this row90TH PERCENTILE AL EXCEEDANCE: No (row sample period)
Source page7
Source tableLead and Copper Sampled in the Distribution System
Report rowLead
Reported measurement90TH PERCENTILE: 2
Range in reportTAP SAMPLE RANGE (LOW-HIGH): 0 to 15
Sites above action level0
Testing period in report06/04/2024 to 07/10/2024
Unitppb
Limit or standard field90TH PERCENTILE AL: 15
Status printed for this row90TH PERCENTILE AL EXCEEDANCE: No (row sample period)
Source page7
Source tableLead and Copper Sampled in the Distribution System
Disinfection Byproducts Sampled in the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Total Haloacetic Acids (HAA5) | AVERAGE: 27.37; AVERAGE: 27.37 | RANGE LOW-HIGH: 18.3 to 41.3 | 2024 | ppb | MCL: 60; MCLG: N/A | MCL VIOLATION: No (row sample period) | 7 | Disinfection Byproducts Sampled in the Distribution System |
| Total Trihalomethanes (TTHM) | AVERAGE: 63.09; AVERAGE: 63.09 | RANGE LOW-HIGH: 37.8 to 105.1 | 2024 | ppb | MCL: 80; MCLG: N/A | MCL VIOLATION: No (row sample period) | 7 | Disinfection Byproducts Sampled in the Distribution System |
Report rowTotal Haloacetic Acids (HAA5)
Reported measurementAVERAGE: 27.37; AVERAGE: 27.37
Range in reportRANGE LOW-HIGH: 18.3 to 41.3
Testing period in report2024
Unitppb
Limit or standard fieldMCL: 60; MCLG: N/A
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page7
Source tableDisinfection Byproducts Sampled in the Distribution System
Report rowTotal Trihalomethanes (TTHM)
Reported measurementAVERAGE: 63.09; AVERAGE: 63.09
Range in reportRANGE LOW-HIGH: 37.8 to 105.1
Testing period in report2024
Unitppb
Limit or standard fieldMCL: 80; MCLG: N/A
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page7
Source tableDisinfection Byproducts Sampled in the Distribution System
Disinfectant Byproducts Precursors Sampled at the Entry Point to the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Total Organic Carbon Ratio | AVERAGE: 1.14; AVERAGE: 1.14 | RANGE LOW-HIGH: 0.86 to 1.33 | 2024 | Ratio | TT Minimum Ratio: 1.00 | TT VIOLATION: No (row sample period) | 8 | Disinfectant Byproducts Precursors Sampled at the Entry Point to the Distribution System |
Report rowTotal Organic Carbon Ratio
Reported measurementAVERAGE: 1.14; AVERAGE: 1.14
Range in reportRANGE LOW-HIGH: 0.86 to 1.33
Testing period in report2024
UnitRatio
Limit or standard fieldTT Minimum Ratio: 1.00
Status printed for this rowTT VIOLATION: No (row sample period)
Source page8
Source tableDisinfectant Byproducts Precursors Sampled at the Entry Point to the Distribution System
Summary of Turbidity Sampled at the Entry Point to the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Turbidity - Highest single measurement | LEVEL FOUND: Highest single measurement: 0.46 NTU | Highest single measurement: 0.46 NTU | Date/Month: Jan | NTU | TT REQUIREMENT: Maximum 1 NTU for any single measurement | TT VIOLATION: No (row sample period) | 8 | Summary of Turbidity Sampled at the Entry Point to the Distribution System |
| Turbidity - Lowest monthly percentage | LEVEL FOUND: Lowest monthly percentage of samples meeting TT requirement for our technology: 99% | Monthly result: 99% | Date/Month: Jan | % | TT REQUIREMENT: In any month, at least 95% of samples must be less than 0.3 NTU | TT VIOLATION: No (row sample period) | 8 | Summary of Turbidity Sampled at the Entry Point to the Distribution System |
Report rowTurbidity - Highest single measurement
Reported measurementLEVEL FOUND: Highest single measurement: 0.46 NTU
Range in reportHighest single measurement: 0.46 NTU
Testing period in reportDate/Month: Jan
UnitNTU
Limit or standard fieldTT REQUIREMENT: Maximum 1 NTU for any single measurement
Status printed for this rowTT VIOLATION: No (row sample period)
Source page8
Source tableSummary of Turbidity Sampled at the Entry Point to the Distribution System
Report rowTurbidity - Lowest monthly percentage
Reported measurementLEVEL FOUND: Lowest monthly percentage of samples meeting TT requirement for our technology: 99%
Range in reportMonthly result: 99%
Testing period in reportDate/Month: Jan
Unit%
Limit or standard fieldTT REQUIREMENT: In any month, at least 95% of samples must be less than 0.3 NTU
Status printed for this rowTT VIOLATION: No (row sample period)
Source page8
Source tableSummary of Turbidity Sampled at the Entry Point to the Distribution System
Radionuclides Sampled at the Entry Point to the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Gross Alpha | AVERAGE: 0.55; AVERAGE: 0.55 | RANGE LOW-HIGH: 0 to 1.1 | 2021 | pCi/L | MCL: 15; MCLG: 0 | MCL VIOLATION: No (row sample period) | 9 | Radionuclides Sampled at the Entry Point to the Distribution System |
| Combined Radium | AVERAGE: 0.85; AVERAGE: 0.85 | RANGE LOW-HIGH: 0.6 to 1.1 | 2021 | pCi/L | MCL: 5; MCLG: 0 | MCL VIOLATION: No (row sample period) | 9 | Radionuclides Sampled at the Entry Point to the Distribution System |
Report rowGross Alpha
Reported measurementAVERAGE: 0.55; AVERAGE: 0.55
Range in reportRANGE LOW-HIGH: 0 to 1.1
Testing period in report2021
UnitpCi/L
Limit or standard fieldMCL: 15; MCLG: 0
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page9
Source tableRadionuclides Sampled at the Entry Point to the Distribution System
Report rowCombined Radium
Reported measurementAVERAGE: 0.85; AVERAGE: 0.85
Range in reportRANGE LOW-HIGH: 0.6 to 1.1
Testing period in report2021
UnitpCi/L
Limit or standard fieldMCL: 5; MCLG: 0
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page9
Source tableRadionuclides Sampled at the Entry Point to the Distribution System
Inorganic Contaminants Sampled at the Entry Point to the Distribution System
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Limit or standard field | Status printed for this row | Source page | Source table |
|---|---|---|---|---|---|---|---|---|
| Barium | AVERAGE: 0.05; AVERAGE: 0.05 | RANGE LOW-HIGH: 0.05 to 0.05 | 2024 | ppm | MCL: 2; MCLG: 2 | MCL VIOLATION: No (row sample period) | 9 | Inorganic Contaminants Sampled at the Entry Point to the Distribution System |
| Chromium | AVERAGE: 1; AVERAGE: 1 | RANGE LOW-HIGH: 1 to 1 | 2024 | ppb | MCL: 100; MCLG: 100 | MCL VIOLATION: No (row sample period) | 9 | Inorganic Contaminants Sampled at the Entry Point to the Distribution System |
| Fluoride | AVERAGE: 0.54; AVERAGE: 0.54 | RANGE LOW-HIGH: 0.52 to 0.56 | 2024 | ppm | MCL: 4; MCLG: 4 | MCL VIOLATION: No (row sample period) | 9 | Inorganic Contaminants Sampled at the Entry Point to the Distribution System |
| Selenium | AVERAGE: 3; AVERAGE: 3 | RANGE LOW-HIGH: 2 to 4 | 2024 | ppb | MCL: 50; MCLG: 50 | MCL VIOLATION: No (row sample period) | 10 | Inorganic Contaminants Sampled at the Entry Point to the Distribution System |
Report rowBarium
Reported measurementAVERAGE: 0.05; AVERAGE: 0.05
Range in reportRANGE LOW-HIGH: 0.05 to 0.05
Testing period in report2024
Unitppm
Limit or standard fieldMCL: 2; MCLG: 2
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page9
Source tableInorganic Contaminants Sampled at the Entry Point to the Distribution System
Report rowChromium
Reported measurementAVERAGE: 1; AVERAGE: 1
Range in reportRANGE LOW-HIGH: 1 to 1
Testing period in report2024
Unitppb
Limit or standard fieldMCL: 100; MCLG: 100
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page9
Source tableInorganic Contaminants Sampled at the Entry Point to the Distribution System
Report rowFluoride
Reported measurementAVERAGE: 0.54; AVERAGE: 0.54
Range in reportRANGE LOW-HIGH: 0.52 to 0.56
Testing period in report2024
Unitppm
Limit or standard fieldMCL: 4; MCLG: 4
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page9
Source tableInorganic Contaminants Sampled at the Entry Point to the Distribution System
Report rowSelenium
Reported measurementAVERAGE: 3; AVERAGE: 3
Range in reportRANGE LOW-HIGH: 2 to 4
Testing period in report2024
Unitppb
Limit or standard fieldMCL: 50; MCLG: 50
Status printed for this rowMCL VIOLATION: No (row sample period)
Source page10
Source tableInorganic Contaminants Sampled at the Entry Point to the Distribution System
Secondary Contaminants
| Report row | Reported measurement | Range in report | Testing period in report | Unit | Source page | Source table |
|---|---|---|---|---|---|---|
| Sodium | AVERAGE: 22.65; AVERAGE: 22.65 | RANGE LOW-HIGH: 22 to 23.3 | 2024 | ppm | 11 | Secondary Contaminants |
Report rowSodium
Reported measurementAVERAGE: 22.65; AVERAGE: 22.65
Range in reportRANGE LOW-HIGH: 22 to 23.3
Testing period in report2024
Unitppm
Source page11
Source tableSecondary Contaminants
Chlorine
- Likely source listed in report
- Water additive used to control microbes
- Source table
- Disinfectants Sampled in the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Copper
- Likely source listed in report
- Corrosion of household plumbing systems; Erosion of natural deposits
- Source table
- Lead and Copper Sampled in the Distribution System
Preservation and source notes
- reported values are preserved without a current-status, safety, or household-level inference.
Lead
- Likely source listed in report
- Corrosion of household plumbing systems; Erosion of natural deposits
- Source table
- Lead and Copper Sampled in the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Total Haloacetic Acids (HAA5)
- Likely source listed in report
- By-product of drinking water disinfection
- Source table
- Disinfection Byproducts Sampled in the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Total Trihalomethanes (TTHM)
- Likely source listed in report
- By-product of drinking water disinfection
- Source table
- Disinfection Byproducts Sampled in the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Total Organic Carbon Ratio
- Likely source listed in report
- Not listed for this report row
- Source table
- Disinfectant Byproducts Precursors Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Turbidity - Highest single measurement
- Likely source listed in report
- Soil Runoff
- Source table
- Summary of Turbidity Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Turbidity - Lowest monthly percentage
- Likely source listed in report
- Soil Runoff
- Source table
- Summary of Turbidity Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Gross Alpha
- Likely source listed in report
- Erosion of natural deposits
- Source table
- Radionuclides Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Combined Radium
- Likely source listed in report
- Erosion of natural deposits
- Source table
- Radionuclides Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Barium
- Likely source listed in report
- Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits
- Source table
- Inorganic Contaminants Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Chromium
- Likely source listed in report
- Discharge from steel and pulp mills; erosion of natural deposits
- Source table
- Inorganic Contaminants Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Fluoride
- Likely source listed in report
- Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories
- Source table
- Inorganic Contaminants Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values are preserved without a current-status, safety, or household-level inference.
Selenium
- Likely source listed in report
- Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines
- Source table
- Inorganic Contaminants Sampled at the Entry Point to the Distribution System
Preservation and source notes
- reported values, periods, units, ranges, criteria, and printed status cells are preserved without a current-status, safety, or household-level inference.
Sodium
- Likely source listed in report
- Not listed for this report row
- Source table
- Secondary Contaminants
Preservation and source notes
- reported values, periods, units, ranges, criteria, footnotes, and printed status cells are preserved without a current-status, safety, or household-level inference.
Report Context
Context attributed to the source report
These summaries are limited to the named annual report and do not assert live system, compliance, or advisory status.
Report identity and scope
The official City of Lafayette document prints the system name LAFAYETTE CITY OF, PWS ID CO0107473, a 2025 report title, and the calendar-year 2024 reporting boundary.
Material-page review
All 14 physical PDF pages were visually reviewed. Pages 6 through 11 print 15 result rows across eight table sections. Pages 11 and 12 contain a blank UCMR table, pages 13 and 14 contain a dated inspection notice, and pages 3 and 4 print report terms and abbreviations. Pages 1 through 5 also contain identity, provider, health, lead, service-line, source-water assessment, contact, and educational context.
Definitions printed in this report
- Maximum Contaminant Level (MCL)
- The highest level of a contaminant allowed in drinking water.
- Treatment Technique (TT)
- A required process intended to reduce the level of a contaminant in drinking water.
- Health-Based
- A violation of either a MCL or TT.
- Non-Health-Based
- A violation that is not a MCL or TT.
- Action Level (AL)
- The concentration of a contaminant which, if exceeded, triggers treatment and other regulatory requirements.
- Maximum Residual Disinfectant Level (MRDL)
- The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
- Maximum Contaminant Level Goal (MCLG)
- The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
- Maximum Residual Disinfectant Level Goal (MRDLG)
- The level of a drinking water disinfectant, below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
- Violation (No Abbreviation)
- Failure to meet a Colorado Primary Drinking Water Regulation.
- Formal Enforcement Action (No Abbreviation)
- Escalated action taken by the State (due to the risk to public health, or number or severity of violations) to bring a non-compliant water system back into compliance.
- Variance and Exemptions (V/E)
- Department permission not to meet a MCL or treatment technique under certain conditions.
- Gross Alpha (No Abbreviation)
- Gross alpha particle activity compliance value. It includes radium-226, but excludes radon 222, and uranium.
- Picocuries per liter (pCi/L)
- Measure of the radioactivity in water.
- Nephelometric Turbidity Unit (NTU)
- Measure of the clarity or cloudiness of water. Turbidity in excess of 5 NTU is just noticeable to the typical person.
- Compliance Value (No Abbreviation)
- Single or calculated value used to determine if regulatory contaminant level (e.g. MCL) is met. Examples of calculated values are the 90th Percentile, Running Annual Average (RAA) and Locational Running Annual Average (LRAA).
- Average (x-bar)
- The mathematical average of all sample results.
- Range (R)
- Lowest value to the highest value.
- Sample Size (n)
- Number or count of values (i.e. number of water samples collected).
- Parts per million = Milligrams per liter (ppm = mg/L)
- One part per million corresponds to one minute in two years or a single penny in $10,000.
- Parts per billion = Micrograms per liter (ppb = ug/L)
- One part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000.
- Not Applicable (N/A)
- Does not apply or not available.
- Level 1 Assessment
- A study of the water system to identify potential problems and determine (if possible) why total coliform bacteria have been found in our water system.
- Level 2 Assessment
- A very detailed study of the water system to identify potential problems and determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have been found in our water system on multiple occasions.
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 reportReport Disclosures
Source-period disclosures kept separate from live status
These items preserve report wording and scope. They do not create violation records, advisory records, or a current-status conclusion.
Historical annual-report boundary
The official document is titled 2025 Drinking Water Quality Report and says its detected-contaminant tables cover January 1 through December 31, 2024 unless otherwise noted. Printed 2021, 2024, and 2025 periods, provider statements, results, source-water descriptions, lead/service-line language, and the inspection notice remain historical report evidence and do not establish current compliance, a current notice or advisory, water safety, address-level service, service-line material at a particular property, or conditions at a particular tap.
Current status is not asserted. Check official current sources for notices or instructions.
UCMR table has no analyte-level result
The unregulated-contaminant table spans pages 11 and 12 but prints no contaminant name, year, average, range, sample count, or unit. It is reviewed and intentionally not converted into a structured result or favorable absence claim.
Current status is not asserted. Check official current sources for notices or instructions.
Historical inspection notice
Pages 13 and 14 reproduce a notice about chlorine analyzer verification and missing corrective-action documentation found during a December 17, 2024 inspection for the 2021-2024 review period. The notice says the issue was corrected January 15, 2025 and distributed June 30, 2025. Those source statements are retained as dated annual-report context without creating a current violation, compliance, notice, advisory, or safety conclusion.
- Begin printed in report
- 12/17/2024
- End printed in report
- 01/15/2025
Current status is not asserted. Check official current sources for notices or instructions.
System preview remains unchanged
All 15 complete source-result rows remain attached to the historical report. The City of Lafayette system profile keeps its existing Barium and Selenium preview rows and does not expand to the other report rows or infer representative current system conditions.
Current status is not asserted. Check official current sources for notices or instructions.
Evidence
Official report and system source paths
Use official federal, state, utility, or report sources before treating a page as final.
Utility report
Report identity and field provenance
- report document: Lafayette City of 2025 Drinking Water Quality Report All 14 physical pages were visually reviewed; SHA-256 22c25fcc272bb48c193e1eaf395f7c9d0702bf575adeb5247c46b1e98af6f462.
- official provider water-quality path: City of Lafayette Water Quality The City-controlled water-quality path links the report and provides official utility context.
City of Lafayette profile
Return to the evergreen public water-system profile and its broader source context.
View City of Lafayette profileLafayette city page
Return to the city-to-system browse path without treating city boundaries as the water service area.
View Lafayette city pageData and trust
How this report summary is handled
Review the methodology, limitations, and correction process behind the information shown on this page.
Methodology
Review source hierarchy, PWSID matching, and missing-data handling.
View MethodologyLimitations
See why annual report summaries are not live status or complete laboratory history.
View LimitationsCorrections
Send an official source if a report identity, row, or link needs review.
View Corrections