Tap Water Quality Report
Tap water quality in PARKER, Colorado
Tap water in PARKER, Colorado receives a grade of D (60/100) from TapWaterSafety.org. It's served by PARKER WSD. The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Radium, combined (-226 and -228) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in PARKER's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving PARKER.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.3 ppt, 300x above the EWG health guideline of 0.001 ppt.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 8.78 ppb, 146x above the EWG health guideline of 0.06 ppb.
Radium, combined (-226 and -228) significantly above health guideline
Moderate concernRadium, combined (-226 and -228) detected at 2.84 pCi/L, 57x above the EWG health guideline of 0.05 pCi/L.
Arsenic detected
Moderate concernArsenic detected at 0.208 ppb.
EPA compliance record
Official U.S. EPA records for PARKER WSD (system ID CO0118040) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Lead and Copper Rule Revisions | Missed reporting | 07/02/2025 | Resolved |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Missed testing or reporting | 07/01/2024 | Resolved |
| Surface Water Treatment Rule | Missed testing or reporting | 09/01/2023 | Resolved |
| Long Term 2 Enhanced Surface Water Treatment Rule | Missed testing or reporting | 02/01/2024 | Resolved |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for PARKER
Filters matched to the specific contaminants in PARKER's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for radium (NSF/ANSI 58)
$429-$750RO certified for radium 226/228 reduces it; ion-exchange water softeners also reduce radium.
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 PARKER'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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.3 ppt | 0.001 | 10.0 | — | — | — | — | 300× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
8.78 ppb | 0.06 | — | — | — | — | — | 146× over |
| Radium, combined (-226 and -228) Radiological |
2.84 pCi/L | 0.05 | 5.0 | — | — | — | — | 57× over |
| Arsenic Heavy metal |
0.208 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 52× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
7.28 ppb | 0.15 | 80.0 | 100 | — | — | — | 49× over |
| Bromodichloromethane Disinfection byproduct |
2.28 ppb | 0.06 | — | — | — | — | — | 38× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
3.01 ppb | 0.1 | 60.0 | 60 | — | — | — | 30× over |
| Dibromoacetic acid Disinfection byproduct |
0.86 ppb | 0.03 | — | — | — | — | — | 29× over |
| Dibromochloromethane Disinfection byproduct |
2.31 ppb | 0.1 | — | — | — | — | — | 23× over |
| Dichloroacetic acid Disinfection byproduct |
1.41 ppb | 0.2 | — | — | — | — | — | 7.1× over |
| Trichloroacetic acid Disinfection byproduct |
0.641 ppb | 0.1 | — | — | — | — | — | 6.4× over |
| Chloroform Disinfection byproduct |
1.7 ppb | 0.4 | — | — | — | — | — | 4.3× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.35 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 3.9× over |
| Bromoform Disinfection byproduct |
0.988 ppb | 0.5 | — | — | — | — | — | 2.0× over |
| Chromium (hexavalent) Heavy metal |
0.0281 ppb | 0.02 | — | — | — | — | — | 1.4× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.225 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Uranium Radiological |
0.22 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Nitrate Inorganic |
0.0498 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate and nitrite Inorganic |
0.0413 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Chlorate Disinfection byproduct |
50.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
21.7 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chlorite Disinfection byproduct |
10.5 ppb | 50.0 | 1000.0 | — | — | — | — | Below guideline |
| Barium Heavy metal |
136.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
1.17 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.838 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Vanadium Other |
0.519 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.005 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.107 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Cobalt Other |
0.0639 ppb | 70.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.85 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.238 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.388 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.2 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.161 ppb | — | — | — | — | — | — | Below guideline |
| Alpha-hexachlorocyclohexane Radiological |
0.00122 ppb | — | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.0138 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.972 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 PARKER WSD.