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Tap water quality report

Klamath, CA

EPA monitoring detected 12 contaminants across the 10 water suppliers serving Klamath. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

10
water suppliers
1,641
people served
12
contaminants found
California rankings Lead in California PFAS in California

What was found in Klamath'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
400144 µg/L 4001%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Highest in the city: REDWOOD PARK C.S.D. · 200 people · 2019
1/10 SYR4
Nitrate
1197.8 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: KLAMATH C.S.D. · 360 people · 2019
Highest in the city: 2500 µg/L — Yurok - Requa · 215 people · 2019
10/10 SYR4
Copper
84 µg/L 6.5%
of the EPA limit 1300 µg/L
Main supplier: KLAMATH C.S.D. · 360 people · 2014
3/10 SYR4
TTHM
46.6 µg/L 58%
of the EPA limit 80 µg/L
Highest in the city: Yurok - McCoy - Kenek · 30 people · 2019
5/10 SYR4
Total Haloacetic Acids (HAA5)
42.4 µg/L 71%
of the EPA limit 60 µg/L
Highest in the city: Yurok - Wautec · 96 people · 2019
4/10 SYR4
Barium
15 µg/L 0.8%
of the EPA limit 2000 µg/L
Highest in the city: Yurok - Terwer Water System · 300 people · 2012
6/10 SYR4
Lead
9.4 µg/L 63%
of the EPA limit 15 µg/L
Main supplier: KLAMATH C.S.D. · 360 people · 2014
2/10 SYR4
Chromium
2 µg/L 2%
of the EPA limit 100 µg/L
Highest in the city: Yurok - Weitchpec · 120 people · 2018
1/10 SYR4
Gross Alpha, Excl. Radon And U
1.41956 pCi/L 9.5%
of the EPA limit 15 pCi/L
Highest in the city: Yurok - McCoy - Kenek · 30 people · 2017
6/10 SYR4
Combined Uranium
1.11005 µg/L 3.7%
of the EPA limit 30 µg/L
Highest in the city: Pulikla Tribe · 70 people · 2012
1/10 SYR4
Combined Radium (-226 And -228)
0.8450 pCi/L 17%
of the EPA limit 5 pCi/L
Highest in the city: Pulikla Tribe · 70 people · 2012
3/10 SYR4
Lead
0.0057 mg/L 38%
of the EPA limit 0.0150 mg/L
Main supplier: KLAMATH C.S.D. · 360 people · 2024
Highest in the city: 0.0110 mg/L — Yurok - Terwer Water System · 300 people · 2025
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 Klamath

SupplierPopulation served
KLAMATH C.S.D. 360
Yurok - Terwer Water System 300
Yurok - Requa 215
REDWOOD PARK C.S.D. 200
HUNTER VALLEY CSD 174
Yurok - Weitchpec 120
Yurok - Wautec 96
Yurok - Kepel 76
Pulikla Tribe 70
Yurok - McCoy - Kenek 30

Frequently asked questions about Klamath tap water

Is Klamath tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Klamath. 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 Klamath?

10 public water suppliers report drinking-water monitoring for Klamath, California to the EPA. Each is listed above with its population served.

What contaminants are in Klamath's water?

The contaminants EPA monitoring detected in Klamath include Nitrate-Nitrite, Nitrate, Copper, TTHM, Total Haloacetic Acids (HAA5). 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.