St. Marys Water System
EPA ID: AK2270176 · 548 people served · 1 ZIP code
St. Marys Water System carries 26 open EPA violations that remain unresolved in the federal system — approximately 548 people fall within its service area.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for St. Marys Water System Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The St. Marys Water System serves a community with a median household income of $46,667 and an estimated 1,009 residents across its service area. Approximately 54% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
St. Marys Water System's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 29% of homes in Kusilvak Census Area, Alaska rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How St. Marys Water System compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 6 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Lead at 1 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
Total Trihalomethanes (TTHM) at 3 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Fecal Coliform at 22 presence exceeds the EPA maximum of presence.
Stage 1 DBP Rule at 9 mg/L exceeds the EPA maximum of mg/L.
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
St. Marys Water System (EPA ID: AK2270176) is a community water system in Alaska that serves approximately 548 people from surface water sources.
This system serves ZIP code 99658 in Saint Marys.
Average Home Safety Score: B (75/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| August 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| July 1, 2025 | Stage 1 DBP Rule | Monitoring | Unresolved |
| July 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| June 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| May 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| April 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| April 1, 2025 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| March 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| February 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| January 1, 2025 | Stage 1 DBP Rule | Monitoring | Unresolved |
| January 1, 2025 | Fecal Coliform | Monitoring | Unresolved |
| December 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
| November 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
| October 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
| October 1, 2024 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| September 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
| August 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
| August 1, 2024 | Fecal Coliform | Health-based | Resolved |
| July 1, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| July 1, 2024 | Fecal Coliform | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Fecal Coliform | Microbiological | 22 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 9 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 6 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 3 | No |
| E. coli | Microbiological | 2 | Yes |
| Lead | Inorganic | 1 | No |
| Total Organic Carbon | Disinfection Byproducts | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
Health Risk Details
E. coli (EPA limit: Zero tolerance (any positive sample triggers immediate action))
Severe GI illness; potentially fatal kidney failure in children At-risk groups: children under 5, elderly, immunocompromised individuals, pregnant women.
Removal methods: UV disinfection (99.99%), chlorination, reverse osmosis. Find the right filter →
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
- 99658 — Saint Marys
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for St. Marys Water System (AK2270176) on EPA.gov.
Frequently Asked Questions
Is St. Marys Water System water safe to drink?
St. Marys Water System has recorded 2 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does St. Marys Water System serve?
St. Marys Water System serves approximately 548 people across 1 ZIP code in Alaska.
Where does St. Marys Water System get its water?
The primary water source is surface water.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: ST. MARYS WATER SYSTEM Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
St. Marys Water System (EPA ID: AK2270176) — request the latest Consumer Confidence Report or ask about specific contaminants.