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Tap water quality report

Jefferson County Pwsd 1

EPA monitoring tested this supplier for 44 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

44
contaminants tested
14
detected
21,113
people served
0
health-based violations
Missouri rankingsLead in MissouriPFAS in Missouri
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 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
Bromodichloromethane
15.4 µg/L
No EPA limit set
 109/109 SYR4 2012–2019
Chloroform
130 µg/L
No EPA limit set
 109/109 SYR4 2012–2019
TTHM
134 µg/L 168%
of the EPA limit, in the worst sample — 80 µg/L
 109/109 SYR4 2012–2019
Dichloroacetic Acid
49.9 µg/L
No EPA limit set
 108/109 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
60.6 µg/L 101%
of the EPA limit, in the worst sample — 60 µg/L
 102/109 SYR4 2012–2019
Trichloroacetic Acid
7.84 µg/L
No EPA limit set
 96/109 SYR4 2012–2019
Copper
115 µg/L 8.8%
of the EPA limit 1300 µg/L
 87/89 SYR4 2013–2019
Dibromochloromethane
16.9 µg/L
No EPA limit set
 85/109 SYR4 2012–2019
Lead
36.4 µg/L 243%
of the EPA limit, in the worst sample — 15 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
8.36 µg/L
No EPA limit set
 19/109 SYR4 2012–2019
Monochloroacetic Acid
13 µg/L
No EPA limit set
 7/109 SYR4 2012–2019
Bromoform
9.38 µg/L
No EPA limit set
 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
edevore@pwsd1jeffco.org

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.