Is Jefferson County Pwsd 5 Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Jefferson

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
RPT	Monitoring	Unaddressed	2025-07-02
MON	Monitoring	Resolved	2023-02-01 → 2023-02-28
MON	Monitoring	Resolved	2023-02-01 → 2023-02-28
MON	Monitoring	Resolved	2023-02-01 → 2023-02-28
MON	Monitoring	Resolved	2023-02-01 → 2023-02-28
MR	Monitoring	Archived	1993-09-01 → 1993-09-30

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	855.7 µg/L 66% of the EPA limit 1300 µg/L worst single sample: 1800 µg/L	75/76	SYR4	2012–2019
Lead	0.0011 mg/L 7.5% of the EPA limit 0.0150 mg/L	26/26	LCR	2024
Barium	144.5 µg/L 7.2% of the EPA limit 2000 µg/L worst single sample: 155 µg/L	16/16	SYR4	2013–2019
Fluoride	1152.5 µg/L 29% of the EPA limit 4000 µg/L worst single sample: 1280 µg/L	16/16	SYR4	2013–2019
Lead	11.3465 µg/L 76% of the EPA limit 15 µg/L worst single sample: 20.7 µg/L	14/76	SYR4	2012–2019
Nitrate-Nitrite	46 µg/L 0.5% of the EPA limit 10000 µg/L	12/82	SYR4	2012–2019
Chromium	5.078 µg/L 5.1% of the EPA limit 100 µg/L worst single sample: 5.53 µg/L	9/16	SYR4	2013–2019
Chloroform	4.43 µg/L No EPA limit set worst single sample: 5.48 µg/L	6/22	SYR4	2013–2019
Gross Alpha, Excl. Radon And U	6.62 pCi/L 44% of the EPA limit 15 pCi/L worst single sample: 6.8 pCi/L	4/4	SYR4	2012
Bromodichloromethane	2.01 µg/L No EPA limit set worst single sample: 2.08 µg/L	3/22	SYR4	2013–2019
Combined Radium (-226 And -228)	1.82 pCi/L 36% of the EPA limit 5 pCi/L worst single sample: 1.9 pCi/L	3/8	SYR4	2012–2016
Dibromochloromethane	0.7465 µg/L No EPA limit set worst single sample: 0.7500 µg/L	2/22	SYR4	2013–2019
TTHM	3.268 µg/L 4.1% of the EPA limit 80 µg/L worst single sample: 3.41 µg/L	2/7	SYR4	2013–2019
Lithium	27 µg/L No EPA limit set	2/10	UCMR-5	2024
Arsenic	1.63 µg/L 16% of the EPA limit 10 µg/L	1/16	SYR4	2013–2019
Dichloroacetic Acid	1.01 µg/L No EPA limit set	1/7	SYR4	2013–2019

85 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, TotalBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDichloromethaneDalaponDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: PETERS, LISA A
Phone: 636-586-5445
Email: [email protected]

Frequently asked questions about Jefferson County Pwsd 5

Is Jefferson County Pwsd 5 tap water safe to drink?

EPA monitoring detected 16 contaminants in Jefferson County Pwsd 5'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 Jefferson County Pwsd 5's water?

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

How many people does Jefferson County Pwsd 5 serve?

Jefferson County Pwsd 5 reports serving 8,000 people in Missouri, per its EPA record.

Has Jefferson County Pwsd 5 had any water quality violations?

The EPA has 6 violations on file for Jefferson County Pwsd 5, of which 0 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.