Tap WaterIndex

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Tap water quality report

Yankton

EPA monitoring tested this supplier for 51 contaminants and detected 13. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

51
contaminants tested
13
detected
15,411
people served
60
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Local government
Counties served
Yankton

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.

60
health-based violations
84
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2020-01-01 → 2020-03-31
MCL Health-based Resolved 2020-01-01 → 2020-03-31
MCL Health-based Resolved 2019-10-01 → 2019-12-31
MCL Health-based Resolved 2019-10-01 → 2019-12-31
MCL Health-based Resolved 2019-10-01 → 2019-12-31
MCL Health-based Resolved 2019-07-01 → 2019-09-30
MCL Health-based Resolved 2019-07-01 → 2019-09-30
MCL Health-based Resolved 2019-07-01 → 2019-09-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30
MCL Health-based Resolved 2019-04-01 → 2019-06-30

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
TTHM
97.28 µg/L 122%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 154 µg/L
124/124 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
47.635 µg/L 79%
of the EPA limit 60 µg/L
worst single sample: 81 µg/L
124/124 SYR4 2012–2019
Copper
30 µg/L 2.3%
of the EPA limit 1300 µg/L
worst single sample: 110 µg/L
91/91 SYR4 2012–2018
Lead
0.8000 µg/L 5.3%
of the EPA limit 15 µg/L
worst single sample: 1.8 µg/L
91/91 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2024
Nitrate
300 µg/L 3%
of the EPA limit 10000 µg/L
 4/6 SYR4 2017–2019
Lithium
69 µg/L
No EPA limit set
 2/2 UCMR-5 2024
Antimony, Total
0.2600 µg/L 4.3%
of the EPA limit 6 µg/L
 1/1 SYR4 2019
Barium
12.1 µg/L 0.6%
of the EPA limit 2000 µg/L
 1/1 SYR4 2019
Chromium
0.4600 µg/L 0.5%
of the EPA limit 100 µg/L
 1/1 SYR4 2019
Fluoride
740 µg/L 19%
of the EPA limit 4000 µg/L
 1/1 SYR4 2017
Gross Alpha, Excl. Radon And U
0.7000 pCi/L 4.7%
of the EPA limit 15 pCi/L
 1/1 SYR4 2012
Selenium
0.6900 µg/L 1.4%
of the EPA limit 50 µg/L
 1/1 SYR4 2019
38 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaArsenicBeryllium, TotalCadmiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityHfpo-DaMercuryNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaThallium, Total

Utility contact

Contact
SAGE CHYTKA
Phone
6056685272
Email
[email protected]

Frequently asked questions about Yankton

Is Yankton tap water safe to drink?

EPA monitoring detected 13 contaminants in Yankton'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 Yankton's water?

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

How many people does Yankton serve?

Yankton reports serving 15,411 people in South Dakota, per its EPA record.

Has Yankton had any water quality violations?

The EPA has 84 violations on file for Yankton, of which 60 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.