No open health-based violations on EPA record in the last 10 years.
Serves about 698 people (328 connections) with groundwater bought from Sioux Rural Water System.
From EPA's record for SD4600002. PurityMap is independent of Castlewood.
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1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From June 2021 | Stage 1 Disinfectants and Disinfection Byproducts Rule | – | – | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →Castlewood's phone number on EPA record is 6057932220. Its mailing address is PO BOX 17, CASTLEWOOD, SD 57223.
According to EPA's record, Castlewood uses groundwater bought from Sioux Rural Water System.
EPA's record shows 1 health-based violation for Castlewood in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Castlewood's latest lead and copper round, which ended in December 2022, was 1 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Castlewood. Its phone number on EPA record is 6057932220. Its mailing address on EPA record is PO BOX 17, CASTLEWOOD, SD 57223. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.