Water Quality Report · Updated May 12, 2026
PARKER WSD
PARKER WSD delivers tap water graded D (55/100) by TapWaterSafety.org. The utility serves approximately 75,949 residents in PARKER, Colorado using surface water. 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. For questions, the utility can be reached at 303-841-2058.
Is PARKER tap water safe to drink?
PARKER WSD delivers tap water that earns a grade of D (55/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including pfas contamination.
The utility serves 75,949 residents in PARKER, drawing from surface water.
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA9), Radium, combined (-226 and -228), Arsenic, Total trihalomethanes (TTHMs), Bromodichloromethane, Haloacetic acids (HAA5), Dibromoacetic acid, Dibromochloromethane, Dichloroacetic acid, Trichloroacetic acid, Chloroform, Perfluorooctanoic acid (PFOA), Bromoform, Chromium (hexavalent). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for PARKER residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for PARKER WSD.
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.
Contact PARKER WSD
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for PARKER
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis or water softener
$249-$750RO removes radium effectively; ion-exchange water softeners also reduce radium concentration.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 55/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
PARKER WSD service area
This water system serves 1 community in Douglas County, Colorado. Click any city for its dedicated tap water quality page.
Find the right filter for PARKER water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.