South Delaware Company Regional Water Authority
EPA ID: OK1221645 · 1,500 people served · 4 ZIP codes
South Delaware Company Regional Water Authority shows 6 open EPA violations in current federal records for approximately 1,500 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 1 (2021) to 19 (2024). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for South Delaware Company Regional Water Authority Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The South Delaware Company Regional Water Authority serves a community with a median household income of $46,175 and an estimated 18,173 residents across its service area. Approximately 49% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 100% 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?
South Delaware Company Regional Water Authority'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 3% of homes in Delaware County, Oklahoma 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 South Delaware Company Regional Water Authority compares to EPA limits
What This Means For You
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.
Stage 2 DBP Rule at 6 mg/L exceeds the EPA maximum of mg/L.
Chlorite at 2 mg/L exceeds the EPA maximum of 1 mg/L. Anemia and nervous system effects in infants and children. Consider ferrous sulfate reduction filtration.
Surface Water Treatment Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 2 presence exceeds the EPA maximum of presence.
Total Trihalomethanes (TTHM) 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
South Delaware Company Regional Water Authority (EPA ID: OK1221645) is a community water system in Oklahoma that serves approximately 1,500 people from surface water sources.
This system provides water to 4 ZIP codes across 4 communities.
Average Home Safety Score: C (64/100)
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 |
|---|---|---|---|
| April 1, 2025 | Contaminant 2959 | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| August 1, 2024 | Chlorite | Monitoring | Resolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| March 1, 2024 | E. coli | Health-based | Unresolved |
| January 1, 2024 | Contaminant 1052 | Monitoring | Resolved |
| July 1, 2023 | Chlorite | Monitoring | Resolved |
| January 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 2 DBP Rule | Treatment Failure | 6 | Yes |
| Chlorite | Disinfection Byproducts | 2 | No |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Revised Total Coliform Rule | Microbiological | 2 | No |
| Contaminant 1052 | Other Violation | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Contaminant 2959 | Other Violation | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| Fecal Coliform | Microbiological | 1 | Yes |
| E. coli | Microbiological | 1 | Yes |
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
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 74347 | 0.0018 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 OK or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for South Delaware Company Regional Water Authority (OK1221645) on EPA.gov.
Frequently Asked Questions
Is South Delaware Company Regional Water Authority water safe to drink?
South Delaware Company Regional Water Authority has recorded 5 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 South Delaware Company Regional Water Authority serve?
South Delaware Company Regional Water Authority serves approximately 1,500 people across 4 ZIP codes in Oklahoma.
Where does South Delaware Company Regional Water Authority get its water?
The primary water source is surface water.
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 SOUTH DELAWARE CO REGIONAL WATER AUTH. 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: SOUTH DELAWARE CO REGIONAL WATER AUTH. Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
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 SOUTH DELAWARE CO REGIONAL WATER AUTH. 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.
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.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Federal compliance violations on record
These entries are taken verbatim from the utility's CCR violations section. EPA defines four broad violation categories: Maximum Contaminant Level (MCL), Treatment Technique (TT), Monitoring & Reporting (M&R), and Public Notification (PN).
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monitoring · TOTAL ORGANIC CARBON2024-08-01
Did not monitor or test for TOTAL ORGANIC CARBON during the period 8/1/2024 - 8/31/2024. 1 sample required, 1 sample missing.
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monitoring · SODIUM2024-01-01
Did not monitor or test for SODIUM during the period 1/1/2024 - 12/31/2024. 1 sample required, 1 sample missing.
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monitoring · TOTAL ORGANIC CARBON2024-08-01
Also missed taking TOTAL ORGANIC CARBON samples during 8/1/2024 - 8/31/2024 (duplicate monitoring period noted).
Violations record from SOUTH DELAWARE CO REGIONAL WATER AUTH. Consumer Confidence Report.
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
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
South Delaware Company Regional Water Authority (EPA ID: OK1221645) — request the latest Consumer Confidence Report or ask about specific contaminants.