Tap Water Quality Report
Tap water quality in WESTMINSTER, Colorado
Tap water in WESTMINSTER, Colorado receives a grade of D (67/100) from TapWaterSafety.org. It's served by WESTMINSTER CITY OF. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromodichloromethane significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in WESTMINSTER's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving WESTMINSTER.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 19.6 ppb, 327x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 32.8 ppb, 219x above the EWG health guideline of 0.15 ppb.
Bromodichloromethane significantly above health guideline
Moderate concernBromodichloromethane detected at 11.9 ppb, 198x above the EWG health guideline of 0.06 ppb.
Recommended filters for WESTMINSTER
Filters matched to the specific contaminants in WESTMINSTER's water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in WESTMINSTER's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
19.6 ppb | 0.06 | — | — | — | — | — | 327× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
32.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 219× over |
| Bromodichloromethane Disinfection byproduct |
11.9 ppb | 0.06 | — | — | — | — | — | 198× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
9.73 ppb | 0.1 | 60.0 | 60 | — | — | — | 97× over |
| Dibromochloromethane Disinfection byproduct |
8.76 ppb | 0.1 | — | — | — | — | — | 88× over |
| Dibromoacetic acid Disinfection byproduct |
1.48 ppb | 0.03 | — | — | — | — | — | 49× over |
| Chloroform Disinfection byproduct |
11.0 ppb | 0.4 | — | — | — | — | — | 28× over |
| Trichloroacetic acid Disinfection byproduct |
2.79 ppb | 0.1 | — | — | — | — | — | 28× over |
| Dichloroacetic acid Disinfection byproduct |
5.44 ppb | 0.2 | — | — | — | — | — | 27× over |
| Chromium (hexavalent) Heavy metal |
0.178 ppb | 0.02 | — | — | — | — | — | 8.9× over |
| Radium, combined (-226 and -228) Radiological |
0.29 pCi/L | 0.05 | 5.0 | — | — | — | — | 5.8× over |
| Bromoform Disinfection byproduct |
1.16 ppb | 0.5 | — | — | — | — | — | 2.3× over |
| Uranium Radiological |
0.39 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Chlorate Disinfection byproduct |
176.7 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
3.06 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
46.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
0.499 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Vanadium Other |
0.015 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0219 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.191 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.347 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.577 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
20.4 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from WESTMINSTER CITY OF.