Klamath County Water Quality

Name: Klamath County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Klamath County, Oregon: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Klamath County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)KLAMATH FALLS WATER DEPT4.0 ng/L federal MCL (2024) · US EPA9.5 ng/L

KLAMATH FALLS WATER DEPT9.5 ng/LSample date: 2024-03-20 to 2024-09-10

Perfluorohexanesulfonic acid (PFHxS)KLAMATH FALLS WATER DEPT10 ng/L federal MCL (2024) · US EPA5.8 ng/L

KLAMATH FALLS WATER DEPT5.8 ng/LSample date: 2024-03-20 to 2024-09-10

Perfluorobutanesulfonic acid (PFBS)KLAMATH FALLS WATER DEPT2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA4.3 ng/L

KLAMATH FALLS WATER DEPT4.3 ng/LSample date: 2024-03-20 to 2024-09-10

28 substances tested, none detected in this systemShow

Tested in this system: KLAMATH FALLS WATER DEPT

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
Lead (90th percentile)
Lithium
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

1 city

Cities ranked by the records

1
Klamath FallsKLAMATH FALLS WATER DEPT
PFAS sample above a limit
Open city report →

Showing 1 of 1 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Klamath County1 of 1 city report had a PFAS sample above a 2024 EPA limit

Klamath Falls9.5 ng/L

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Oregon

Lead

0of 1 city above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Oregon

Who supplies the county

Largest water systems

Klamath FallsKLAMATH FALLS WATER DEPT · OR4100443
40,475 served

Questions

Frequently asked

How does Klamath County tap water compare across cities?

PurityMap ranks 1 city in Klamath County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Klamath Falls's main water system: KLAMATH FALLS WATER DEPT · PWSID OR4100443 · Purity Score 57 (Fair) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Klamath County cities had a PFAS sample above a 2024 EPA limit?

1 of 1 Klamath County city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Klamath Falls (PFOS 9.5 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.

Is there lead in Klamath County tap water?

Utilities report lead as a 90th-percentile result from home taps. 0 of 1 Klamath County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Next step

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