Tap WaterIndex

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Tap water quality report

Jefferson

EPA monitoring tested this supplier for 8 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

8
contaminants tested
6
detected
475
people served
13
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Local government
Counties served
Union

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.

13
health-based violations
75
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2014-02-01
TT Health-based Resolved 2014-02-01
MCL Health-based Resolved 2010-09-01 → 2010-09-30
MCL Health-based Resolved 2010-09-01 → 2010-09-30
MCL Health-based Resolved 2010-09-01 → 2010-09-30
TT Health-based Resolved 2004-12-02
TT Health-based Resolved 2004-12-02
MCL Health-based Resolved 2000-05-01 → 2000-05-31
MCL Health-based Resolved 2000-05-01 → 2000-05-31
MCL Health-based Resolved 2000-05-01 → 2000-05-31

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 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
Copper
360 µg/L 28%
of the EPA limit 1300 µg/L
 20/20 SYR4 2014–2017
Lead
7.4 µg/L 49%
of the EPA limit 15 µg/L
 20/20 SYR4 2014–2017
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
TTHM
39.5 µg/L 49%
of the EPA limit 80 µg/L
 8/8 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
15.4 µg/L 26%
of the EPA limit 60 µg/L
 7/8 SYR4 2013–2019
Fluoride
710 µg/L 18%
of the EPA limit 4000 µg/L
 1/1 SYR4 2019
2 contaminants tested, none detected
NitrateNitrite

Utility contact

Contact
DUSTIN SHARKEY
Phone
6059665838
Email
dustinsharkey.jeffersonsdpd@gmail.com

Frequently asked questions about Jefferson

Is Jefferson tap water safe to drink?

EPA monitoring detected 6 contaminants in Jefferson'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's water?

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

How many people does Jefferson serve?

Jefferson reports serving 475 people in South Dakota, per its EPA record.

Has Jefferson had any water quality violations?

The EPA has 75 violations on file for Jefferson, of which 13 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.