Tap WaterIndex

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Tap water quality report

Castlewood

EPA monitoring tested this supplier for 11 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

11
contaminants tested
7
detected
698
people served
11
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
GWP
Ownership
Local government
Counties served
Hamlin

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.

11
health-based violations
137
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2021-06-07
TT Health-based Resolved 2021-06-07
MCL Health-based Resolved 2002-09-01 → 2002-09-30
MCL Health-based Resolved 2002-09-01 → 2002-09-30
MCL Health-based Resolved 2002-09-01 → 2002-09-30
MCL Health-based Resolved 1996-06-01 → 1996-06-30
MCL Health-based Resolved 1996-06-01 → 1996-06-30
MCL Health-based Resolved 1996-06-01 → 1996-06-30
MCL Health-based Resolved 1996-05-01 → 1996-05-31
MCL Health-based Resolved 1996-05-01 → 1996-05-31

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
2570 µg/L 198%
of the EPA limit, in the worst sample — 1300 µg/L
 100/100 SYR4 2014–2019
Lead
59.6 µg/L 397%
of the EPA limit, in the worst sample — 15 µg/L
 100/100 SYR4 2014–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2022
Nitrate
7300 µg/L 73%
of the EPA limit 10000 µg/L
 14/14 SYR4 2017–2019
TTHM
41.5 µg/L 52%
of the EPA limit 80 µg/L
 9/9 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
18 µg/L 30%
of the EPA limit 60 µg/L
 9/9 SYR4 2013–2019
Gross Alpha, Excl. Radon And U
13.4 pCi/L 89%
of the EPA limit 15 pCi/L
 2/2 SYR4 2014–2017
4 contaminants tested, none detected
Combined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityNitrite

Utility contact

Contact
RYAN SIKKINK
Phone
6057932220
Email
castmain@itctel.com

Frequently asked questions about Castlewood

Is Castlewood tap water safe to drink?

EPA monitoring detected 7 contaminants in Castlewood'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 Castlewood's water?

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

How many people does Castlewood serve?

Castlewood reports serving 698 people in South Dakota, per its EPA record.

Has Castlewood had any water quality violations?

The EPA has 137 violations on file for Castlewood, of which 11 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.