Boulder Colony
EPA ID: SD4600339 · 26 people served · 1 ZIP code
Water monitoring history at Boulder Colony shows a clean slate — EPA tracking over the past five years turned up no violations, and 26 residents continue to receive fully compliant service.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 1 (2023) to 1 (2025). The pattern suggests growing compliance challenges.
Service Area Demographics
The Boulder Colony serves a community with a median household income of $66,786 and an estimated 383 residents across its service area. Approximately 88% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Boulder Colony's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 0% of homes in Edmunds County, South Dakota rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in South Dakota
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Boulder Colony (EPA ID: SD4600339) is a community water system in South Dakota that serves approximately 26 people from groundwater sources.
This system serves ZIP code 57448 in Hosmer.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 57448 — Hosmer
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Boulder Colony (SD4600339) on EPA.gov.
Frequently Asked Questions
Is Boulder Colony water safe to drink?
Based on EPA records, Boulder Colony has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Boulder Colony serve?
Boulder Colony serves approximately 26 people across 1 ZIP code in South Dakota.
Where does Boulder Colony get its water?
The primary water source is groundwater.