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 |
|---|---|---|---|
| Fluoride | 5700 µg/L 143% of the EPA limit, at the 95th percentile of samples — 4000 µg/L Highest in the city: CIENEGA WATER COMPANY INC · 108 people · 2019 | 8/10 | SYR4 |
| Nitrate | 1380 µg/L 14% of the EPA limit 10000 µg/L Highest in the city: CIENEGA WATER COMPANY INC · 108 people · 2019 | 8/10 | SYR4 |
| Copper | 1305.5 µg/L 100% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Highest in the city: EPCOR - MOOVALYA KEYS · 1,298 people · 2019 | 7/10 | SYR4 |
| Nitrate-Nitrite | 950 µg/L 9.5% of the EPA limit 10000 µg/L Highest in the city: CIENEGA WATER COMPANY INC · 108 people · 2013 | 7/10 | SYR4 |
| Lithium | 150 µg/L No EPA limit set Main supplier: Colorado River Regional Water System · 3,476 people · 2025 | 1/10 | UCMR-5 |
| Barium | 120 µg/L 6% of the EPA limit 2000 µg/L Highest in the city: EPCOR - RIO LINDO · 79 people · 2019 | 7/10 | SYR4 |
| TTHM | 64.2 µg/L 80% of the EPA limit 80 µg/L Main supplier: Colorado River Regional Water System · 3,476 people · 2019
Highest in the city: 115.4 µg/L — EPCOR - MOOVALYA KEYS · 1,298 people · 2019 | 8/10 | SYR4 |
| Chloroform | 51.52 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 9.5 µg/L 16% of the EPA limit 60 µg/L Main supplier: Colorado River Regional Water System · 3,476 people · 2019
Highest in the city: 48.96 µg/L — EPCOR - MOOVALYA KEYS · 1,298 people · 2019 | 8/10 | SYR4 |
| Bromodichloromethane | 30.17 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Lead | 30.1 µg/L 201% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the city: EPCOR - RIO LINDO · 79 people · 2019 | 7/10 | SYR4 |
| Dichloroacetic Acid | 18.45 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Dibromochloromethane | 16.02 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Trichloroacetic Acid | 12.025 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Combined Uranium | 7.39785 µg/L 25% of the EPA limit 30 µg/L Highest in the city: Lost Lake Resort · 355 people · 2015 | 1/10 | SYR4 |
| Arsenic | 6.95 µg/L 70% of the EPA limit 10 µg/L Highest in the city: Lost Lake Resort · 355 people · 2015 | 8/10 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5 pCi/L 33% of the EPA limit 15 pCi/L Highest in the city: Lost Lake Resort · 355 people · 2015 | 1/10 | SYR4 |
| Selenium | 3.6 µg/L 7.2% of the EPA limit 50 µg/L Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 5/10 | SYR4 |
| Dibromoacetic Acid | 3.3 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 6/10 | SYR4 |
| Monochloroacetic Acid | 3.25 µg/L No EPA limit set Highest in the city: EPCOR - MARINA VILLAGE · 528 people · 2019 | 1/10 | SYR4 |
| Chromium | 2.985 µg/L 3% of the EPA limit 100 µg/L Highest in the city: CIENEGA WATER COMPANY INC · 108 people · 2018 | 1/10 | SYR4 |
| Bromoform | 2.14 µg/L No EPA limit set Highest in the city: EPCOR - LAKESIDE · 1,775 people · 2019 | 6/10 | SYR4 |
| Combined Radium (-226 And -228) | 0.7000 pCi/L 14% of the EPA limit 5 pCi/L Highest in the city: Lost Lake Resort · 355 people · 2012 | 1/10 | SYR4 |
| Lead | 0.0023 mg/L 15% of the EPA limit 0.0150 mg/L Main supplier: Colorado River Regional Water System · 3,476 people · 2022
Highest in the city: 0.0062 mg/L — EPCOR - MOOVALYA KEYS · 1,298 people · 2023 | 10/10 | 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 |
|---|---|
| Colorado River Regional Water System | 3,476 |
| Town of Parker | 3,360 |
| EPCOR - LAKESIDE | 1,775 |
| EPCOR - MOOVALYA KEYS | 1,298 |
| EPCOR - HOLIDAY HARBOR | 559 |
| EPCOR - MARINA VILLAGE | 528 |
| EPCOR - PARKER DAM | 429 |
| Lost Lake Resort | 355 |
| CIENEGA WATER COMPANY INC | 108 |
| EPCOR - RIO LINDO | 79 |
Frequently asked questions about Parker tap water
Is Parker tap water safe to drink?
EPA testing detected 24 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?
10 public water suppliers report drinking-water monitoring for Parker, Arizona 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 Fluoride, Nitrate, Copper, Nitrate-Nitrite, Lithium. 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.