Is Pasco, WA Tap Water Safe? Quality & Contaminants

What was found in Pasco's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate-Nitrite	22900 µg/L 229% of the EPA limit, in the worst sample — 10000 µg/L	8/14	SYR4
Nitrate	19100 µg/L 191% of the EPA limit, in the worst sample — 10000 µg/L	13/14	SYR4
Fluoride	1810 µg/L 45% of the EPA limit 4000 µg/L	10/14	SYR4
Nitrite	120 µg/L 12% of the EPA limit 1000 µg/L	2/14	SYR4
Barium	115 µg/L 5.8% of the EPA limit 2000 µg/L	6/14	SYR4
TTHM	66 µg/L 83% of the EPA limit 80 µg/L	4/14	SYR4
Chloroform	62.5 µg/L No EPA limit set	4/14	SYR4
Total Haloacetic Acids (HAA5)	52.3 µg/L 87% of the EPA limit 60 µg/L	4/14	SYR4
Trichloroacetic Acid	34.1 µg/L No EPA limit set	2/14	SYR4
Dichloroacetic Acid	23.7 µg/L No EPA limit set	2/14	SYR4
Bromoform	22.7 µg/L No EPA limit set	3/14	SYR4
Combined Uranium	18.7 µg/L 62% of the EPA limit 30 µg/L	3/14	SYR4
Dibromochloromethane	16.7 µg/L No EPA limit set	4/14	SYR4
Arsenic	14 µg/L 140% of the EPA limit, in the worst sample — 10 µg/L	5/14	SYR4
Bromodichloromethane	12.1 µg/L No EPA limit set	4/14	SYR4
Selenium	7.1 µg/L 14% of the EPA limit 50 µg/L	2/14	SYR4
Copper	7 µg/L 0.5% of the EPA limit 1300 µg/L	2/14	SYR4
Lead	4.8 µg/L 32% of the EPA limit 15 µg/L	3/14	SYR4
Monochloroacetic Acid	3.374 µg/L No EPA limit set	2/14	SYR4
Chromium	2 µg/L 2% of the EPA limit 100 µg/L	1/14	SYR4
Dibromoacetic Acid	1.6 µg/L No EPA limit set	3/14	SYR4
Monobromoacetic Acid	0.2310 µg/L No EPA limit set	1/14	SYR4
Lead	0.0021 mg/L 14% of the EPA limit 0.0150 mg/L	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 single worst sample on record — 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 highest level found 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.