What was found in Pasco'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 | 489 µg/L 4.9% of the EPA limit 10000 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 21915 µg/L — RANGEVIEW · 122 people · 2013 | 8/14 | SYR4 |
| Nitrate | 995 µg/L 10% of the EPA limit 10000 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 9320 µg/L — RANGEVIEW · 122 people · 2019 | 13/14 | SYR4 |
| Fluoride | 749 µg/L 19% of the EPA limit 4000 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 1724 µg/L — Clark Addition Water System · 189 people · 2016 | 10/14 | SYR4 |
| Nitrite | 120 µg/L 12% of the EPA limit 1000 µg/L Highest in the city: PREDATOR RIDGE · 66 people · 2019 | 2/14 | SYR4 |
| Barium | 28 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 115 µg/L — RIVER RIDGE ESTATES · 77 people · 2016 | 6/14 | SYR4 |
| TTHM | 58.32 µg/L 73% of the EPA limit 80 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019 | 4/14 | SYR4 |
| Chloroform | 54.5 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019 | 4/14 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.595 µg/L 68% of the EPA limit 60 µg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019 | 4/14 | SYR4 |
| Trichloroacetic Acid | 21.69 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019 | 2/14 | SYR4 |
| Bromoform | 20.255 µg/L No EPA limit set Highest in the city: NORTH SLOPE ESTATES PROPERTY · 97 people · 2019 | 3/14 | SYR4 |
| Dichloroacetic Acid | 18.755 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019 | 2/14 | SYR4 |
| Combined Uranium | 18.63 µg/L 62% of the EPA limit 30 µg/L Highest in the city: Hi-Point Housing · 96 people · 2019 | 3/14 | SYR4 |
| Arsenic | 13.95 µg/L 140% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: Hi-Point Housing · 96 people · 2019 | 5/14 | SYR4 |
| Dibromochloromethane | 0.5850 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 13.4075 µg/L — CLEARWATER DOMESTIC WATER ASSN · 78 people · 2017 | 4/14 | SYR4 |
| Bromodichloromethane | 4.5 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 9.948 µg/L — CLEARWATER DOMESTIC WATER ASSN · 78 people · 2017 | 4/14 | SYR4 |
| Selenium | 7.1 µg/L 14% of the EPA limit 50 µg/L Highest in the city: Hi-Point Housing · 96 people · 2019 | 2/14 | SYR4 |
| Copper | 7 µg/L 0.5% of the EPA limit 1300 µg/L Highest in the city: SUNSET DOMESTIC WATER ASSN · 60 people · 2019 | 2/14 | SYR4 |
| Lead | 4.8 µg/L 32% of the EPA limit 15 µg/L Highest in the city: NORTH SLOPE ESTATES PROPERTY · 97 people · 2019 | 3/14 | SYR4 |
| Monochloroacetic Acid | 2.09 µg/L No EPA limit set Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2019
Highest in the city: 3.374 µg/L — RIVER RIDGE ESTATES · 77 people · 2019 | 2/14 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L Highest in the city: PREDATOR RIDGE · 66 people · 2019 | 1/14 | SYR4 |
| Dibromoacetic Acid | 1.561 µg/L No EPA limit set Highest in the city: RIVER RIDGE ESTATES · 77 people · 2019 | 3/14 | SYR4 |
| Monobromoacetic Acid | 0.2310 µg/L No EPA limit set Highest in the city: RIVER RIDGE ESTATES · 77 people · 2019 | 1/14 | SYR4 |
| Lead | 0.0019 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: PASCO WATER DEPARTMENT · 115,102 people · 2023
Highest in the city: 0.0021 mg/L — RIVER RIDGE ESTATES · 77 people · 2023 | 14/14 | 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 Pasco
| Supplier | Population served |
|---|---|
| PASCO WATER DEPARTMENT | 115,102 |
| Clark Addition Water System | 189 |
| RANGEVIEW | 122 |
| NORTH SLOPE ESTATES PROPERTY | 97 |
| Canyon Farm Camp | 96 |
| Hi-Point Housing | 96 |
| Graystone WS | 94 |
| CLEARWATER DOMESTIC WATER ASSN | 78 |
| RIVER RIDGE ESTATES | 77 |
| PREDATOR RIDGE | 66 |
| J & B Orchards - South | 63 |
| SUNSET DOMESTIC WATER ASSN | 60 |
| LAKEVIEW | 50 |
| KEPPS ACRES ASSOCIATION | 35 |
Frequently asked questions about Pasco tap water
Is Pasco tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Pasco. 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 Pasco?
14 public water suppliers report drinking-water monitoring for Pasco, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Pasco's water?
The contaminants EPA monitoring detected in Pasco include Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, 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.