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Tap water quality report

St Clair

EPA monitoring tested this supplier for 93 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

93
contaminants tested
10
detected
4,700
people served
51
health-based violations
Missouri rankingsLead in MissouriPFAS in Missouri
Water source
Ground water
Ownership
Local government
Counties served
Franklin

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

51
health-based violations
75
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-10-01 → 2015-10-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31
MCL Health-based Resolved 2015-08-01 → 2015-08-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0056 µg/L 2/14 2024

Other contaminants detected

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate-Nitrite
840 µg/L 8.4%
of the EPA limit 10000 µg/L
 92/112 SYR4 2012–2019
Copper
156 µg/L 12%
of the EPA limit 1300 µg/L
 44/54 SYR4 2014–2017
Lead
7.45 µg/L 50%
of the EPA limit 15 µg/L
 35/54 SYR4 2014–2017
Lead
0.0024 mg/L 16%
of the EPA limit 0.0150 mg/L
 22/22 LCR 2025
Barium
235 µg/L 12%
of the EPA limit 2000 µg/L
 14/14 SYR4 2014–2017
Arsenic
2.51 µg/L 25%
of the EPA limit 10 µg/L
 11/14 SYR4 2014–2017
Fluoride
260 µg/L 6.5%
of the EPA limit 4000 µg/L
 8/14 SYR4 2014–2017
Chromium
1.48 µg/L 1.5%
of the EPA limit 100 µg/L
 5/14 SYR4 2014–2017
Combined Radium (-226 And -228)
2.5 pCi/L 50%
of the EPA limit 5 pCi/L
 1/6 SYR4 2017
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDibromochloromethaneDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
IVIE, JASON
Phone
636-629-0333
Email
publicworks@stclairmo.us

Frequently asked questions about St Clair

Is St Clair tap water safe to drink?

EPA monitoring detected 10 contaminants in St Clair's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in St Clair's water?

EPA monitoring detected Nitrate-Nitrite, Copper, Lead, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does St Clair serve?

St Clair reports serving 4,700 people in Missouri, per its EPA record.

Has St Clair had any water quality violations?

The EPA has 75 violations on file for St Clair, of which 51 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

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.