Grayhorse Rwd
EPA ID: OK3005717 · 100 people served · 2 ZIP codes
Grayhorse Rwd shows 39 open EPA violations in current federal records for approximately 100 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 (2023) to 14 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Grayhorse Rwd Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Grayhorse Rwd serves a community with a median household income of $69,682 and an estimated 13,870 residents across its service area. Approximately 80% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 82% 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?
Grayhorse Rwd'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 Kay 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 Grayhorse Rwd compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 33 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Arsenic at 1 mg/L exceeds the EPA maximum of 0.01 mg/L.
Total Trihalomethanes (TTHM) at 7 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Chlorite at 12 mg/L exceeds the EPA maximum of 1 mg/L. Anemia and nervous system effects in infants and children. Consider ferrous sulfate reduction filtration.
Stage 1 DBP Rule at 4 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. 4 detections recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS).
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
Similar-sized systems in Oklahoma
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
Grayhorse Rwd (EPA ID: OK3005717) is a community water system in Oklahoma that serves approximately 100 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: B (70/100)
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 29, 2025 | Haloacetic Acids (HAA5) | Monitoring | Unresolved |
| July 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| April 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| January 1, 2025 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| October 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| September 29, 2024 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| July 1, 2024 | Chlorite | Health-based | Unresolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| April 1, 2024 | Chlorite | Health-based | Unresolved |
| April 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| January 1, 2024 | Chlorite | Health-based | Unresolved |
| January 1, 2024 | Contaminant 1052 | Monitoring | Resolved |
| January 1, 2024 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| October 2, 2023 | Surface Water Treatment Rule | Monitoring | Resolved |
| October 1, 2023 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
| October 1, 2023 | Chlorite | Health-based | Unresolved |
| September 29, 2023 | Haloacetic Acids (HAA5) | Monitoring | Resolved |
| July 1, 2023 | Haloacetic Acids (HAA5) | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 33 | Yes |
| Chlorite | Disinfection Byproducts | 12 | Yes |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 7 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 4 | No |
| Contaminant 4100 | Other Violation | 3 | No |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Arsenic | Inorganic | 1 | No |
| Contaminant 1052 | Other Violation | 1 | No |
| Total Organic Carbon | Disinfection Byproducts | 1 | No |
Health Risk Details
Haloacetic Acids (HAA5) (EPA limit: 0.06 mg/L)
Cancer risk; reproductive & developmental effects At-risk groups: pregnant women, infants, long-term consumers of chlorinated municipal water.
Removal methods: granular activated carbon (GAC), carbon block filter, 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 →
Total Trihalomethanes (TTHM) (EPA limit: 0.08 mg/L)
Bladder & rectal cancer risk; reproductive concerns At-risk groups: pregnant women, long-term consumers of chlorinated water, people who frequently shower in chlorinated water.
Removal methods: granular activated carbon (GAC), carbon block filter, point-of-entry aeration. 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 |
|---|---|---|---|
| 74637 | 0.0023 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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 Grayhorse Rwd (OK3005717) on EPA.gov.
Frequently Asked Questions
Is Grayhorse Rwd water safe to drink?
Grayhorse Rwd has recorded 42 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 Grayhorse Rwd serve?
Grayhorse Rwd serves approximately 100 people across 2 ZIP codes in Oklahoma.
Where does Grayhorse Rwd 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: GRAYHORSE RWD 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.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Treatment classification and chemical list sourced from GRAYHORSE RWD 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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public notice · CONSUMER CONFIDENCE RULE2024-07-01
CCR REPORT
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treatment technique · TOTAL HALOACETIC ACIDS (HAA5)2024-09-29 to 2024-05-28
FAILURE SUBMIT OEL REPORT FOR HAA5
-
treatment technique · TTHM2024-09-29 to 2024-05-28
FAILURE SUBMIT OEL REPORT FOR TTHM
-
treatment technique · TTHM2024-09-29 to 2025-01-02
FAILURE SUBMIT OEL REPORT FOR TTHM
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MCL · TTHM2024-01-01 to 2024-03-31
LRAA
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MCL · TTHM2024-04-01 to 2024-06-30
LRAA
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MCL · TTHM2024-07-01 to 2024-09-30
LRAA
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MCL · TTHM2024-10-01 to 2024-12-31
LRAA
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treatment technique · CARBON, TOTAL2024-03-01 to 2024-03-31
INADEQUATE DBP PRECURSOR REMOVAL
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treatment technique · CARBON, TOTAL2024-06-01 to 2024-06-30
INADEQUATE DBP PRECURSOR REMOVAL
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treatment technique · CARBON, TOTAL2024-09-01 to 2024-09-30
INADEQUATE DBP PRECURSOR REMOVAL
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monitoring · SODIUM2024-01-01 to 2024-12-31
ROUTINE MAJOR
Violations record from GRAYHORSE RWD 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
Grayhorse Rwd (EPA ID: OK3005717) — request the latest Consumer Confidence Report or ask about specific contaminants.