McClain County Water Quality
McClain County, Oklahoma: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
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.
LithiumNEWCASTLE10 µg/L EPA health reference level (screening, not a legal limit) · US EPA40 µg/L
- NEWCASTLE40 µg/LSample date: 2023-05-09 to 2024-01-25
Lead (90th percentile)NEWCASTLE15 µg/L federal action level · US EPA22.5 µg/L
- NEWCASTLE22.5 µg/LMonitoring period: 2026–2026 (still open)
Perfluorobutanoic acid (PFBA)NEWCASTLENo federal or state limit; shown for transparency5.2 ng/L
- NEWCASTLE5.2 ng/LSample date: 2023-03-27 to 2023-11-14
28 PFAS tested, none detected in this systemShow
Tested in this system: NEWCASTLE
- 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)
- 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)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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.
1of 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 OklahomaLargest water systems
- NewcastleNEWCASTLE · OK20047047,900 served
Frequently asked
How does McClain County tap water compare across cities?
PurityMap ranks 1 city in McClain 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 Newcastle's main water system: NEWCASTLE · PWSID OK2004704 · Purity Score 68 (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 McClain County cities have PFAS above the federal limit?
None of the 1 McClain County cities on record had a regulated PFAS above the 2024 federal limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.
Is there lead in McClain County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 1 McClain County cities reported a value above zero, and 1 city 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.
Follow McClain County's water
Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.
Record changes only
We email when places in McClain County get new results. Unsubscribe any time.
Double opt-in: we email a confirmation link. Unsubscribe anytime. No spam.