Tap WaterIndex

← South Dakota

Tap water quality report

Maxwell Colony

EPA monitoring tested this supplier for 19 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

19
contaminants tested
9
detected
150
people served
20
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Private
Counties served
Bon Homme

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
431
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2023-11-29
TT Health-based Resolved 2023-11-29
MCL Health-based Resolved 2016-05-01 → 2016-05-31
MCL Health-based Resolved 2016-05-01 → 2016-05-31
MCL Health-based Resolved 2016-05-01 → 2016-05-31
MCL Health-based Resolved 2008-10-01 → 2008-10-31
MCL Health-based Resolved 2008-10-01 → 2008-10-31
MCL Health-based Resolved 2008-10-01 → 2008-10-31
MCL Health-based Resolved 2004-09-01 → 2004-09-30
MCL Health-based Resolved 2004-09-01 → 2004-09-30

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 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
30 µg/L 2.3%
of the EPA limit 1300 µg/L
 15/15 SYR4 2013–2019
Lead
1.4 µg/L 9.3%
of the EPA limit 15 µg/L
 15/15 SYR4 2013–2019
Lead
0.0080 mg/L 53%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
 1/1 SYR4 2019
Barium
11.9 µg/L 0.6%
of the EPA limit 2000 µg/L
 1/1 SYR4 2019
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 1/1 SYR4 2019
Gross Alpha, Excl. Radon And U
6.8 pCi/L 45%
of the EPA limit 15 pCi/L
 1/1 SYR4 2016
Selenium
0.5500 µg/L 1.1%
of the EPA limit 50 µg/L
 1/1 SYR4 2019
Thallium, Total
0.1600 µg/L 8%
of the EPA limit 2 µg/L
 1/1 SYR4 2019
10 contaminants tested, none detected
Antimony, TotalBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityMercuryNitrateNitrite

Utility contact

Contact
JONAS WIPF
Email
jonasw@maxwellcolony.com

Frequently asked questions about Maxwell Colony

Is Maxwell Colony tap water safe to drink?

EPA monitoring detected 9 contaminants in Maxwell Colony'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 Maxwell Colony's water?

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

How many people does Maxwell Colony serve?

Maxwell Colony reports serving 150 people in South Dakota, per its EPA record.

Has Maxwell Colony had any water quality violations?

The EPA has 431 violations on file for Maxwell Colony, 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.