Is Jefferson County Pwsd 1 Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Jefferson

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

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
Bromodichloromethane	11 µg/L No EPA limit set worst single sample: 15.4 µg/L	109/109	SYR4	2012–2019
Chloroform	65.46 µg/L No EPA limit set worst single sample: 130 µg/L	109/109	SYR4	2012–2019
TTHM	75.78 µg/L 95% of the EPA limit 80 µg/L worst single sample: 134 µg/L	109/109	SYR4	2012–2019
Dichloroacetic Acid	42.45 µg/L No EPA limit set worst single sample: 49.9 µg/L	108/109	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	47.625 µg/L 79% of the EPA limit 60 µg/L worst single sample: 60.6 µg/L	102/109	SYR4	2012–2019
Trichloroacetic Acid	5.655 µg/L No EPA limit set worst single sample: 7.84 µg/L	96/109	SYR4	2012–2019
Copper	11.4 µg/L 0.9% of the EPA limit 1300 µg/L worst single sample: 115 µg/L	87/89	SYR4	2013–2019
Dibromochloromethane	3.954 µg/L No EPA limit set worst single sample: 16.9 µg/L	85/109	SYR4	2012–2019
Lead	15.435 µg/L 103% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 36.4 µg/L	24/89	SYR4	2013–2019
Lead	0.0073 mg/L 48% of the EPA limit 0.0150 mg/L	21/21	LCR	2025
Dibromoacetic Acid	5.723 µg/L No EPA limit set worst single sample: 8.36 µg/L	19/109	SYR4	2012–2019
Monochloroacetic Acid	12.52 µg/L No EPA limit set worst single sample: 13 µg/L	7/109	SYR4	2012–2019
Bromoform	8.561 µg/L No EPA limit set worst single sample: 9.38 µg/L	4/109	SYR4	2012–2019
Monobromoacetic Acid	8.85 µg/L No EPA limit set	1/109	SYR4	2012–2019

30 contaminants tested, none detected

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Utility contact

Contact: DE VORE, ERIN
Phone: 636-296-0659
Email: [email protected]

Frequently asked questions about Jefferson County Pwsd 1

Is Jefferson County Pwsd 1 tap water safe to drink?

EPA monitoring detected 14 contaminants in Jefferson County Pwsd 1'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 1's water?

EPA monitoring detected Bromodichloromethane, Chloroform, TTHM, Dichloroacetic Acid, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Jefferson County Pwsd 1 serve?

Jefferson County Pwsd 1 reports serving 21,113 people in Missouri, per its EPA record.

Has Jefferson County Pwsd 1 had any water quality violations?

The EPA has no formal drinking-water violations on file for Jefferson County Pwsd 1.

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.