Southwest Regional Water District
EPA ID: OH0903912 · 42,856 people served · 21 ZIP codes
Not yet resolved: 1 EPA violation at Southwest Regional Water District, affecting about 42,856 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Southwest Regional Water District Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The Southwest Regional Water District serves a community with a median household income of $73,586 and an estimated 363,399 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Southwest Regional Water District'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 1% of homes in Hamilton County, Ohio rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 68th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Southwest Regional Water District compares to EPA limits
What This Means For You
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 2 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 40 detections recorded. 10 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Lead was detected in this water system. reverse osmosis 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
Southwest Regional Water District (EPA ID: OH0903912) is a community water system in Ohio that serves approximately 42,856 people from groundwater sources.
This system provides water to 21 ZIP codes across 16 communities.
Average Home Safety Score: C (62/100)
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 |
|---|---|---|---|
| December 30, 2024 | Surface Water Treatment Rule | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| August 14, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| November 1, 2023 | Consumer Confidence Report Rule | Monitoring | Resolved |
| October 20, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 2, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| August 18, 2023 | Lead and Copper Rule | Monitoring | Unresolved |
| April 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 2 | No |
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Lead | Inorganic | 1 | No |
| Lead and Copper Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 45013 | 0.0039 mg/L | No | N/A |
| 45064 | 0.0024 mg/L | No | N/A |
| 45062 | 0.0019 mg/L | No | N/A |
| 45003 | 0.0016 mg/L | No | N/A |
| 45330 | 0.0015 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High 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: 17 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 4 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 45002 — Cleves
- 45003 — College Corner
- 45005 — Franklin
- 45011 — Hamilton
- 45012 — Hamilton
- 45013 — Hamilton
- 45014 — Fairfield
- 45015 — Hamilton
- 45025 — Hamilton
- 45026 — Hamilton
- 45030 — Harrison
- 45042 — Middletown
- 45053 — Okeana
- 45056 — Oxford
- 45062 — Seven Mile
- 45064 — Somerville
- 45067 — Trenton
- 45311 — Camden
- 45320 — Eaton
- 45327 — Germantown
- 45330 — Gratis
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Southwest Regional Water District (OH0903912) on EPA.gov.
Frequently Asked Questions
Is Southwest Regional Water District water safe to drink?
Southwest Regional Water District has recorded 1 health-based violation 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 Southwest Regional Water District serve?
Southwest Regional Water District serves approximately 42,856 people across 21 ZIP codes in Ohio.
Where does Southwest Regional Water District get its water?
The primary water source is groundwater.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from Greene County Sanitary Engineering Department Southwest Regional Water System Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: Greene County Sanitary Engineering Department Southwest Regional 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.
The Ohio EPA determined that the aquifer supplying this system is highly susceptible to contamination due to lack of a confining layer, shallow depth to water, and surrounding potential contaminant sources such as nitrate impacts. Protective strategies are being implemented.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Watershed exposure sources reported
Land-use and natural conditions identified in the utility's source-water assessment as potential contamination sources upstream of treatment.
Treatment classification and chemical list sourced from Greene County Sanitary Engineering Department Southwest Regional Water System Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
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
Southwest Regional Water District (EPA ID: OH0903912) — request the latest Consumer Confidence Report or ask about specific contaminants.