What was found in Parker's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 645.65 µg/L 6.5% of the EPA limit 10000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 2115 µg/L — PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| Nitrate | 662 µg/L 6.6% of the EPA limit 10000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 2000 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Fluoride | 1648.2 µg/L 41% of the EPA limit 4000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 1970 µg/L — STONEGATE MD · 15,295 people · 2017 | 3/3 | SYR4 |
| Chlorite | 296.5 µg/L 30% of the EPA limit 1000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019 | 1/3 | SYR4 |
| Barium | 170 µg/L 8.5% of the EPA limit 2000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 246 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Nitrite | 57 µg/L 5.7% of the EPA limit 1000 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 111 µg/L — PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| TTHM | 32.92 µg/L 41% of the EPA limit 80 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 54 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Lithium | 27.6 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025
Highest in the city: 29.5 µg/L — PINERY WWD · 12,901 people · 2025 | 3/3 | UCMR-5 |
| Combined Uranium | 11.65 µg/L 39% of the EPA limit 30 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 24.35 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 14 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 21.955 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.475 µg/L 16% of the EPA limit 60 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 18.935 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 10 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 17.735 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.145 pCi/L 41% of the EPA limit 15 pCi/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 16.191 pCi/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Bromoform | 6.63 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 11.525 µg/L — STONEGATE MD · 15,295 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 10.4 µg/L No EPA limit set Highest in the city: PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 9.99 pCi/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Adipate | 9.725 µg/L 2.4% of the EPA limit 400 µg/L Main supplier: PARKER WSD · 75,949 people · 2019 | 1/3 | SYR4 |
| Chloroform | 5.7 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 9.3 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 6.2 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 8.855 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 3.9 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 5.75 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 4.665 pCi/L 93% of the EPA limit 5 pCi/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 5.355 pCi/L — PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 4.6 µg/L 77% of the EPA limit 6 µg/L Main supplier: PARKER WSD · 75,949 people · 2019 | 2/3 | SYR4 |
| Toluene | 4.43 µg/L 0.4% of the EPA limit 1000 µg/L Highest in the city: PINERY WWD · 12,901 people · 2019 | 1/3 | SYR4 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 4.08 µg/L — PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 3.86 µg/L — PINERY WWD · 12,901 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 2.7 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 3.375 µg/L — PINERY WWD · 12,901 people · 2019 | 2/3 | SYR4 |
| Chromium | 2.6 µg/L 2.6% of the EPA limit 100 µg/L Main supplier: PARKER WSD · 75,949 people · 2019
Highest in the city: 2.9 µg/L — STONEGATE MD · 15,295 people · 2017 | 2/3 | SYR4 |
| Antimony, Total | 2.3 µg/L 38% of the EPA limit 6 µg/L Highest in the city: PINERY WWD · 12,901 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2019 | 2/3 | SYR4 |
| Hexachlorocyclopentadiene | 0.0640 µg/L 0.1% of the EPA limit 50 µg/L Highest in the city: PINERY WWD · 12,901 people · 2019 | 1/3 | SYR4 |
| Pfpea | 0.0140 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025 | 3/3 | UCMR-5 |
| Pfhxa | 0.0119 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025 | 3/3 | UCMR-5 |
| Pfba | 0.0086 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025 | 2/3 | UCMR-5 |
| Hexachlorobenzene | 0.0076 µg/L 0.8% of the EPA limit 1 µg/L Highest in the city: PINERY WWD · 12,901 people · 2019 | 1/3 | SYR4 |
| PFOA | 0.0048 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025
Highest in the city: 0.0056 µg/L — STONEGATE MD · 15,295 people · 2024 | 2/3 | UCMR-5 |
| PFBS | 0.0046 µg/L No EPA limit set Main supplier: PARKER WSD · 75,949 people · 2025
Highest in the city: 0.0053 µg/L — PINERY WWD · 12,901 people · 2025 | 3/3 | UCMR-5 |
| PFOS | 0.0051 µg/L No EPA limit set Highest in the city: STONEGATE MD · 15,295 people · 2024 | 1/3 | UCMR-5 |
| Pfhpa | 0.0031 µg/L No EPA limit set Highest in the city: STONEGATE MD · 15,295 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: PARKER WSD · 75,949 people · 2025 | 3/3 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Parker
| Supplier | Population served |
|---|---|
| PARKER WSD | 75,949 |
| STONEGATE MD | 15,295 |
| PINERY WWD | 12,901 |
Frequently asked questions about Parker tap water
Is Parker tap water safe to drink?
EPA testing detected 39 contaminants in the water serving Parker. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Parker?
3 public water suppliers report drinking-water monitoring for Parker, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Parker's water?
The contaminants EPA monitoring detected in Parker include Nitrate-Nitrite, Nitrate, Fluoride, Chlorite, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.