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Tap water quality report

North Sioux City

EPA monitoring tested this supplier for 12 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

12
contaminants tested
7
detected
3,042
people served
0
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.

0
health-based violations
67
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2008-01-01 → 2008-03-31
MR Monitoring Resolved 2008-01-01 → 2008-03-31
MR Monitoring Resolved 2008-01-01 → 2008-03-31
MR Monitoring Resolved 2008-01-01 → 2008-03-31
Other Monitoring Resolved 2003-07-01
Other Monitoring Resolved 2003-07-01
Other Monitoring Resolved 2000-07-01 → 2000-08-24
Other Monitoring Resolved 2000-07-01 → 2000-08-24
MR Monitoring Resolved 1999-01-01 → 2000-09-08
MR Monitoring Resolved 1999-01-01 → 2000-09-08

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
Copper
173.5 µg/L 13%
of the EPA limit 1300 µg/L
worst single sample: 240 µg/L
20/20 SYR4 2014–2017
Lead
4.035 µg/L 27%
of the EPA limit 15 µg/L
worst single sample: 4.7 µg/L
20/20 SYR4 2014–2017
Lead
0.0040 mg/L 27%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
TTHM
19.095 µg/L 24%
of the EPA limit 80 µg/L
worst single sample: 22.7 µg/L
8/8 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
7.357 µg/L 12%
of the EPA limit 60 µg/L
worst single sample: 7.49 µg/L
8/8 SYR4 2013–2019
Fluoride
1409 µg/L 35%
of the EPA limit 4000 µg/L
worst single sample: 1440 µg/L
2/2 SYR4 2019
Gross Alpha, Excl. Radon And U
3.575 pCi/L 24%
of the EPA limit 15 pCi/L
worst single sample: 3.6 pCi/L
2/2 SYR4 2014
5 contaminants tested, none detected
Combined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityNitrateNitrite

Utility contact

Contact
RUSTY MONTAGNE
Phone
6052329165
Email
[email protected]

Frequently asked questions about North Sioux City

Is North Sioux City tap water safe to drink?

EPA monitoring detected 7 contaminants in North Sioux City'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 North Sioux City'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 North Sioux City serve?

North Sioux City reports serving 3,042 people in South Dakota, per its EPA record.

Has North Sioux City had any water quality violations?

The EPA has 67 violations on file for North Sioux City, of which 0 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.