City of Rainier
EPA ID: OR4100689 · 1,932 people served · 1 ZIP code
6 open EPA findings remain on record at City of Rainier — the utility supplies approximately 1,932 people.
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 3 (2022) to 5 (2024). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for City of Rainier Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The City of Rainier serves a community with a median household income of $74,453 and an estimated 7,096 residents across its service area. Approximately 64% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 40% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
City of Rainier'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 2% of homes in Columbia County, Oregon 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 City of Rainier compares to EPA limits
What This Means For You
Lead at 2 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 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 7 mg/L exceeds the EPA maximum of mg/L.
Contaminant 0700 at 6 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Lead was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Oregon
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
City of Rainier (EPA ID: OR4100689) is a community water system in Oregon that serves approximately 1,932 people from surface water sources.
This system serves ZIP code 97048 in Rainier.
Average Home Safety Score: C (68/100)
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 |
|---|---|---|---|
| September 1, 2025 | Contaminant 0700 | Monitoring | Unresolved |
| June 1, 2025 | Contaminant 0700 | Monitoring | Unresolved |
| December 6, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| October 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| September 1, 2024 | Contaminant 0700 | Health-based | Resolved |
| August 1, 2024 | E. coli | Health-based | Unresolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| January 1, 2024 | E. coli | Monitoring | Resolved |
| January 1, 2024 | Fecal Coliform | Monitoring | Resolved |
| January 1, 2024 | Total Organic Carbon | Monitoring | Resolved |
| January 1, 2024 | Contaminant 0700 | Health-based | Resolved |
| November 1, 2023 | E. coli | Monitoring | Resolved |
| November 1, 2023 | Fecal Coliform | Monitoring | Resolved |
| July 1, 2023 | Contaminant 0700 | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 7 | No |
| Contaminant 0700 | Other Violation | 6 | Yes |
| Surface Water Treatment Rule | Treatment Failure | 4 | No |
| Stage 1 DBP Rule | Treatment Failure | 3 | No |
| Lead and Copper Rule | Treatment Failure | 3 | No |
| E. coli | Microbiological | 3 | Yes |
| Lead | Inorganic | 2 | No |
| Fecal Coliform | Microbiological | 2 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Chlorite | Disinfection Byproducts | 1 | Yes |
| Total Organic Carbon | Disinfection Byproducts | 1 | No |
| Total Coliform | Microbiological | 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 →
Chlorite (EPA limit: 1 mg/L)
Anemia and nervous system effects in infants and children At-risk groups: infants, developing fetuses, people with G6PD deficiency.
Removal methods: ferrous sulfate reduction, activated carbon, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 97048 | 0.003 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by OR or modeled from parcel and building-footprint data.
- 97048 — Rainier
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Rainier (OR4100689) on EPA.gov.
Frequently Asked Questions
Is City of Rainier water safe to drink?
City of Rainier has recorded 6 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 City of Rainier serve?
City of Rainier serves approximately 1,932 people across 1 ZIP code in Oregon.
Where does City of Rainier get its water?
The primary water source is surface water.
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
City of Rainier (EPA ID: OR4100689) — request the latest Consumer Confidence Report or ask about specific contaminants.