Hosmer, SD
Contamination score
Higher = more contaminated vs. other cities.
Reported illness & cancer claims
No claims reported yet. Be the first to add one.
Claims are aggregated from public records and community reports and may be unverified. If you believe your illness is linked to local water, request a consultation.
Self-reported issues
No issues reported yet. Be the first to report one.

Public water systems
Boulder Colony
- PWSID:
- SD4600339
- Source:
- Ground water
- Serves:
- 26 people
Hosmer
- PWSID:
- SD4600162
- Source:
- Surface water
- Serves:
- 164 people
EPA & DEP violations
Stage 1 Disinfectants and Disinfection Byproducts Rule — TT violation
high severityHealth-basedUnaddressedStage 1 Disinfectants and Disinfection Byproducts Rule TT violation (Unaddressed).
EPA SDWIS · TT · Began Nov 12, 2025 · 7 months ago · Source ↗
Revised Total Coliform Rule — MON violation
medium severityResolvedRevised Total Coliform Rule MON violation (Resolved).
EPA SDWIS · MON · Began Feb 1, 2025 · 1 year ago · Source ↗
Stage 1 Disinfectants and Disinfection Byproducts Rule — TT violation
high severityHealth-basedUnaddressedStage 1 Disinfectants and Disinfection Byproducts Rule TT violation (Unaddressed).
EPA SDWIS · TT · Began Nov 29, 2023 · 2 years ago · Source ↗
Stage 1 Disinfectants and Disinfection Byproducts Rule — TT violation
high severityHealth-basedResolvedStage 1 Disinfectants and Disinfection Byproducts Rule TT violation (Resolved).
EPA SDWIS · TT · Began Feb 1, 2010 · 16 years ago · Source ↗
Violation — Violation violation
medium severityContaminant Violation violation.
EPA SDWIS · Violation · Began — · Source ↗
Water-related lawsuits
No lawsuits on record.
In the news & sources
No coverage linked yet.