1 open health-based violation on EPA record.
Serves about 26 people (8 connections) with groundwater from its own wells.
From EPA's record for SD4600339. PurityMap is independent of Boulder Colony.
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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 November 2025 | Stage 1 Disinfectants and Disinfection Byproducts Rule | – | – | Unaddressed |
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 →Boulder Colony's phone number on EPA record is 6053801487. Its mailing address is 12261 337TH AVENUE, HOSMER, SD 57448.
According to EPA's record, Boulder Colony uses groundwater from its own wells.
EPA's record shows 1 health-based violation for Boulder Colony in the 10 years to July 9, 2026. EPA's record lists 1 open health-based violation. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Boulder Colony's latest lead and copper round, which ended in December 2025. The federal action level is 15 µg/L.
PurityMap has no verified website for Boulder Colony. Its phone number on EPA record is 6053801487. Its mailing address on EPA record is 12261 337TH AVENUE, HOSMER, SD 57448. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.