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Tap water quality report

Jefferson County Water Authority

EPA monitoring tested this supplier for 67 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

67
contaminants tested
20
detected
25
people served
20
health-based violations
Missouri rankingsLead in MissouriPFAS in Missouri
Water source
Ground water under surface influence
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.

20
health-based violations
20
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-04-01 → 2011-06-30
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2011-01-01 → 2011-03-31
MCL Health-based Resolved 2010-10-01 → 2010-12-31
MCL Health-based Resolved 2010-10-01 → 2010-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
21.05 µg/L
No EPA limit set
worst single sample: 22.3 µg/L
60/60 SYR4 2012–2019
Chloroform
35.215 µg/L
No EPA limit set
worst single sample: 56.3 µg/L
60/60 SYR4 2012–2019
Dibromochloromethane
18.11 µg/L
No EPA limit set
worst single sample: 19.8 µg/L
60/60 SYR4 2012–2019
Bromoform
3.7975 µg/L
No EPA limit set
worst single sample: 4.06 µg/L
56/60 SYR4 2012–2019
TTHM
64.905 µg/L 81%
of the EPA limit 80 µg/L
worst single sample: 71 µg/L
52/52 SYR4 2012–2019
Trichloroacetic Acid
6.734 µg/L
No EPA limit set
worst single sample: 9.12 µg/L
52/52 SYR4 2012–2019
Dichloroacetic Acid
19.15 µg/L
No EPA limit set
worst single sample: 20.5 µg/L
51/52 SYR4 2012–2019
Dibromoacetic Acid
4.9475 µg/L
No EPA limit set
worst single sample: 6.13 µg/L
48/52 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
35.28 µg/L 59%
of the EPA limit 60 µg/L
worst single sample: 38.7 µg/L
47/52 SYR4 2012–2019
Nitrate-Nitrite
1040 µg/L 10%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Monobromoacetic Acid
12.54 µg/L
No EPA limit set
worst single sample: 12.8 µg/L
14/52 SYR4 2012–2019
Arsenic
2.1905 µg/L 22%
of the EPA limit 10 µg/L
worst single sample: 2.39 µg/L
8/8 SYR4 2012–2019
Barium
28.455 µg/L 1.4%
of the EPA limit 2000 µg/L
worst single sample: 29.4 µg/L
8/8 SYR4 2012–2019
Fluoride
653 µg/L 16%
of the EPA limit 4000 µg/L
worst single sample: 660 µg/L
8/8 SYR4 2012–2019
Atrazine
0.6675 µg/L 22%
of the EPA limit 3 µg/L
worst single sample: 0.7100 µg/L
6/31 SYR4 2012–2019
Chromium
2.95 µg/L 3%
of the EPA limit 100 µg/L
worst single sample: 3.13 µg/L
6/8 SYR4 2012–2019
Copper
2.893 µg/L 0.2%
of the EPA limit 1300 µg/L
worst single sample: 3.04 µg/L
4/8 SYR4 2012–2019
Carbon Tetrachloride
1.08 µg/L 22%
of the EPA limit 5 µg/L
 1/8 SYR4 2012–2019
Lead
1.86 µg/L 12%
of the EPA limit 15 µg/L
 1/8 SYR4 2012–2019
Monochloroacetic Acid
11.6 µg/L
No EPA limit set
 1/52 SYR4 2012–2019
47 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneDichloromethaneDalaponDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CRANNICK, JEFFREY
Phone
636-933-0106
Email
[email protected]

Frequently asked questions about Jefferson County Water Authority

Is Jefferson County Water Authority tap water safe to drink?

EPA monitoring detected 20 contaminants in Jefferson County Water Authority'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 Water Authority's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, Bromoform, TTHM, and others. The full list with the level and data source for each is above.

How many people does Jefferson County Water Authority serve?

Jefferson County Water Authority reports serving 25 people in Missouri, per its EPA record.

Has Jefferson County Water Authority had any water quality violations?

The EPA has 20 violations on file for Jefferson County Water Authority, of which 20 are health-based (a contaminant limit or required treatment was breached) and 0 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.