Drinking water quality · 2024
· Verified
What's in Westminster, CO tap water
7 contaminants were measured in the Westminster, CO water system's 2024 annual report. Each is shown below against its federal limit.
- Reporting year
- 2024
- Contaminants measured
- 7
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CO
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Westminster, CO
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)below national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Westminster, CO's drinking water comes from surface water, drawn from 2 sources.
Source
- STANDLEY LAKE
- FHL BYPASS
Treatment
- NORTHWEST WATER TREATMENT PLANT
- SEMPER WTP
Distribution
Also buys water from THORNTON CITY OF, ARVADA CITY OF, and 4 more.
Historical readings · EPA Six-Year Review (2012–2019)
19 historically-detected contaminants in Westminster, CO
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
TTHM worst: 2019 | 0.0498 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2013 | 0.0241 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
FLUORIDE worst: 2019 | 0.65 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
DEHP worst: 2015 | 0.0007 mg/L within | 0.006 mg/L | '15 |
NITRITE worst: 2012 | 0.06 mg/L within | 1 mg/L | '12'19 |
BARIUM worst: 2016 | 0.057 mg/L within below national p90 | 2 mg/L | '12'13'14'15'16'17'18'19 |
GROSS ALPHA worst: 2018 | 0.3 pCi/L within | 15 pCi/L | '18 |
NITRATE worst: 2015 | 0.15 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2015 | 0.15 mg/L within | 10 mg/L | '12'13'14'15'16'17'19 |
CHROMIUM worst: 2017 | 0.001 mg/L within below national p90 | 0.1 mg/L | '17'18 |
XYLENES TOTAL worst: 2018 | 0.00068 mg/L within | 10 mg/L | '18'19 |
URANIUM worst: 2018 | 0.0011 ug/L within below national p90 | 30 ug/L | '18 |
DBAA worst: 2018 | 0.00183 mg/L | — | '18'19 |
DCAA worst: 2018 | 0.00743 mg/L | — | '18'19 |
TCAA worst: 2018 | 0.0042 mg/L | — | '18'19 |
BROMODICHLOROMETHANE worst: 2013 | 0.0092 mg/L | — | '13'18'19 |
BROMOFORM worst: 2018 | 0.00101 mg/L | — | '18'19 |
CHLOROFORM worst: 2013 | 0.0076 mg/L | — | '13'18'19 |
DIBROMOCHLOROMETHANE worst: 2013 | 0.005 mg/L | — | '13'18'19 |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Ammonia | 0.36–0.63RangeSystem-wide | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| SodiumA naturally occurring salt component. | 27–28RangeSystem-wide | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 50–64RangeSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 109–8RangeSystem-wide | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 8.4–8.8RangeSystem-wide | None set | Detected — no federal limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 344–451RangeSystem-wide | None set | Detected — no federal limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 209–263RangeSystem-wide | None set | Detected — no federal limit |
People also ask about Westminster, CO's water
+Is Westminster, CO tap water safe to drink in 2024?
Every one of the 7 contaminants measured in Westminster, CO's 2024 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Westminster, CO tap water?
7 contaminants were measured in Westminster, CO's 2024 Consumer Confidence Report, spanning physical & aggregate, inorganic chemicals, and metals. 0 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Westminster, CO's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Westminster, CO's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.