What was found in Kennewick'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 | 5000 µg/L 50% of the EPA limit 10000 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 12515 µg/L — SUNDANCE IMPROVEMENT ASSOCIATION · 100 people · 2019 | 12/12 | SYR4 |
| Nitrate-Nitrite | 3780 µg/L 38% of the EPA limit 10000 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2015
Highest in the city: 7850 µg/L — SUNDANCE IMPROVEMENT ASSOCIATION · 100 people · 2019 | 7/12 | SYR4 |
| Fluoride | 713.9 µg/L 18% of the EPA limit 4000 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014
Highest in the city: 1000 µg/L — BC WATER CO · 1,262 people · 2016 | 12/12 | SYR4 |
| Barium | 60.92 µg/L 3% of the EPA limit 2000 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014
Highest in the city: 100.36 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2018 | 9/12 | SYR4 |
| TTHM | 58.1035 µg/L 73% of the EPA limit 80 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 76.671 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 10/12 | SYR4 |
| Chloroform | 44.175 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 67.77 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 7/12 | SYR4 |
| Total Haloacetic Acids (HAA5) | 24.675 µg/L 41% of the EPA limit 60 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 54.75 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 9/12 | SYR4 |
| Copper | 40.58 µg/L 3.1% of the EPA limit 1300 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014 | 7/12 | SYR4 |
| Trichloroacetic Acid | 15.8 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 34.87 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 3/12 | SYR4 |
| Bromoform | 8.4765 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 28.37 µg/L — BC WATER CO · 1,262 people · 2019 | 10/12 | SYR4 |
| Dichloroacetic Acid | 11.57 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 21.58 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 5/12 | SYR4 |
| Dibromochloromethane | 17.37 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019 | 10/12 | SYR4 |
| Bromodichloromethane | 14.365 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019 | 9/12 | SYR4 |
| Combined Uranium | 12.98 µg/L 43% of the EPA limit 30 µg/L Highest in the city: HOMESTEAD MANUFACTURED HOUSING · 300 people · 2012 | 1/12 | SYR4 |
| Arsenic | 4.74 µg/L 47% of the EPA limit 10 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014
Highest in the city: 10.5 µg/L — HOMESTEAD MANUFACTURED HOUSING · 300 people · 2016 | 6/12 | SYR4 |
| Gross Beta Particle Activity | 10.3165 pCi/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2014 | 3/12 | SYR4 |
| Dibromoacetic Acid | 4.686 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 9.712 µg/L — HOMESTEAD MANUFACTURED HOUSING · 300 people · 2018 | 9/12 | SYR4 |
| Lithium | 9.38 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2023 | 1/12 | UCMR-5 |
| Di(2-ethylhexyl) Phthalate | 4.883 µg/L 81% of the EPA limit 6 µg/L Highest in the city: BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 1/12 | SYR4 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L Highest in the city: BADGER CANYON WATER ASSN · 40 people · 2016 | 4/12 | SYR4 |
| Monochloroacetic Acid | 2.1 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019
Highest in the city: 2.27 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 2/12 | SYR4 |
| Chromium | 1.414 µg/L 1.4% of the EPA limit 100 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014
Highest in the city: 2.2025 µg/L — BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2018 | 5/12 | SYR4 |
| Lead | 1.61 µg/L 11% of the EPA limit 15 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2014 | 2/12 | SYR4 |
| Monobromoacetic Acid | 1.55 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2019 | 2/12 | SYR4 |
| Dichloromethane | 0.8300 µg/L 17% of the EPA limit 5 µg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2019 | 1/12 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.1950 µg/L 0.3% of the EPA limit 70 µg/L Highest in the city: BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 1/12 | SYR4 |
| P-Dichlorobenzene | 0.0700 µg/L 0.1% of the EPA limit 75 µg/L Highest in the city: BADGER MOUNTAIN IRRIGATION DISTRICT · 2,331 people · 2019 | 1/12 | SYR4 |
| PFOS | 0.0115 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| PFHXS | 0.0106 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| Pfpea | 0.0075 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| Pfhxa | 0.0065 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| PFBS | 0.0064 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| PFOA | 0.0046 µg/L No EPA limit set Main supplier: KENNEWICK CITY OF · 118,164 people · 2024 | 1/12 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: KENNEWICK CITY OF · 118,164 people · 2025
Highest in the city: 0.0044 mg/L — TRI-CITY WATER DISTRICT #45 · 300 people · 2025 | 12/12 | 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 Kennewick
| Supplier | Population served |
|---|---|
| KENNEWICK CITY OF | 118,164 |
| BADGER MOUNTAIN IRRIGATION DISTRICT | 2,331 |
| SUMMIT VIEW WATER SYSTEM | 1,869 |
| BC WATER CO | 1,262 |
| Community Sewer and Water District | 1,200 |
| TRI-CITY WATER DISTRICT #45 | 300 |
| HOMESTEAD MANUFACTURED HOUSING | 300 |
| SUNDANCE IMPROVEMENT ASSOCIATION | 100 |
| EATON PARK SUBDIVISION | 70 |
| GOODNIGHT WATER SYSTEM | 47 |
| BADGER CANYON WATER ASSN | 40 |
| GOOD NEIGHBORS WATER ASSN | 40 |
Frequently asked questions about Kennewick tap water
Is Kennewick tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Kennewick. 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 Kennewick?
12 public water suppliers report drinking-water monitoring for Kennewick, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Kennewick's water?
The contaminants EPA monitoring detected in Kennewick include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. 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.