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Tap water quality report

Jefferson County Water Dist #1

EPA monitoring tested this supplier for 67 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

67
contaminants tested
7
detected
600
people served
38
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
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.

38
health-based violations
62
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2014-10-01 → 2014-12-31
MCL Health-based Resolved 2014-10-01 → 2014-12-31
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-04-01 → 2014-06-30
MCL Health-based Resolved 2014-04-01 → 2014-06-30
MCL Health-based Resolved 2014-01-01 → 2014-03-31
MCL Health-based Resolved 2014-01-01 → 2014-03-31

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
Lead
0.0015 mg/L 10%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Nitrate
1460 µg/L 15%
of the EPA limit 10000 µg/L
 12/26 SYR4 2012–2019
Arsenic
7.65 µg/L 77%
of the EPA limit 10 µg/L
worst single sample: 8 µg/L
2/3 SYR4 2014–2019
Nitrate-Nitrite
1425 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1460 µg/L
2/3 SYR4 2014–2019
Barium
2.2 µg/L 0.1%
of the EPA limit 2000 µg/L
 1/3 SYR4 2014–2019
Chromium
1.1 µg/L 1.1%
of the EPA limit 100 µg/L
 1/3 SYR4 2014–2019
Lead
21 µg/L 140%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
 1/3 SYR4 2014–2019
60 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, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEthylene DibromideEndrinEthylbenzeneFluorideHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitritePentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Michael McClure

Frequently asked questions about Jefferson County Water Dist #1

Is Jefferson County Water Dist #1 tap water safe to drink?

EPA monitoring detected 7 contaminants in Jefferson County Water Dist #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 Water Dist #1's water?

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

How many people does Jefferson County Water Dist #1 serve?

Jefferson County Water Dist #1 reports serving 600 people in Washington, per its EPA record.

Has Jefferson County Water Dist #1 had any water quality violations?

The EPA has 62 violations on file for Jefferson County Water Dist #1, of which 38 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.