Nichols Hills
EPA ID: OK2005501 · 4,020 people served · 8 ZIP codes
ZipCheckup's reading of EPA SDWIS for Nichols Hills (OK2005501): 1 past health-based violation, since resolved. On record: Nichols Hills, 69 violations, all resolved, 4,020 in service area.
Data: EPA SDWIS
Service Area Map
Coverage area for Nichols Hills Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Nichols Hills serves a community with a median household income of $60,388 and an estimated 127,895 residents across its service area. Approximately 76% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 46% 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?
Nichols Hills'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.
Infrastructure Risk
Detected Contaminants
How Nichols Hills compares to EPA limits
What This Means For You
Contaminant 2015 at 2 mg/L exceeds the EPA maximum of 0.0005 mg/L. Probable carcinogen; liver & thyroid damage, immune suppression. Consider granular activated carbon (GAC) filtration.
Atrazine at 2 mg/L exceeds the EPA maximum of 0.003 mg/L. Endocrine disruption, cardiovascular & reproductive effects. Consider granular activated carbon (GAC) filtration.
Benzene at 2 mg/L exceeds the EPA maximum of 0.005 mg/L.
Contaminant 2110 at 2 mg/L exceeds the EPA maximum of 0.005 mg/L. Leukemia & blood cancers (known carcinogen). Consider granular activated carbon (GAC) filtration.
Arsenic at 3 mg/L exceeds the EPA maximum of 0.01 mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 8 detections recorded.
Contaminant 2015 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
Nichols Hills (EPA ID: OK2005501) is a community water system in Oklahoma that serves approximately 4,020 people from groundwater sources.
This system provides water to 8 ZIP codes across 1 community.
Violation History
Status breakdown for accepted records with record years 2021-2026: 65 resolved, 4 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2025 | Haloacetic Acids (HAA5) | Non-health-based | Archived |
| January 1, 2025 | Total Trihalomethanes (TTHM) | Non-health-based | Archived |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Non-health-based | Resolved |
| January 1, 2024 | Haloacetic Acids (HAA5) | Non-health-based | Archived |
| January 1, 2024 | Total Trihalomethanes (TTHM) | Non-health-based | Archived |
| January 1, 2024 | Arsenic | Non-health-based | Resolved |
| January 1, 2024 | Arsenic | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2005 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2010 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2015 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2020 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2031 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2032 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2033 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2034 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2035 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2036 | Non-health-based | Resolved |
| January 1, 2024 | Contaminant 2037 | Non-health-based | Resolved |
| January 1, 2024 | Atrazine | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Arsenic | Inorganic | 3 | No |
| Contaminant 2005 | Other Violation | 2 | No |
| Contaminant 2010 | Other Violation | 2 | No |
| Contaminant 2015 | Other Violation | 2 | No |
| Contaminant 2020 | Other Violation | 2 | No |
| Contaminant 2031 | Other Violation | 2 | No |
| Contaminant 2032 | Other Violation | 2 | No |
| Contaminant 2033 | Other Violation | 2 | No |
| Contaminant 2034 | Other Violation | 2 | No |
| Contaminant 2035 | Other Violation | 2 | No |
| Contaminant 2036 | Other Violation | 2 | No |
| Contaminant 2037 | Other Violation | 2 | No |
| Atrazine | Organic | 2 | No |
| Contaminant 2040 | Other Violation | 2 | No |
| Contaminant 2041 | Other Violation | 2 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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.
- 73105 - Oklahoma City
- 73111 - Oklahoma City
- 73112 - Oklahoma City
- 73114 - Oklahoma City
- 73116 - Oklahoma City
- 73118 - Oklahoma City
- 73120 - Oklahoma City
- 73131 - Oklahoma City
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Nichols Hills (OK2005501) on EPA.gov.
Frequently Asked Questions
Is Nichols Hills water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Nichols Hills; its 69 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Nichols Hills serve?
Nichols Hills serves approximately 4,020 people across 8 ZIP codes in Oklahoma.
Where does Nichols Hills get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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 →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Nichols Hills (OK): 1 Health Violation. https://zipcheckup.com/water-system/ok2005501/
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title = {{Nichols Hills (OK): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ok2005501/}
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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
Nichols Hills (EPA ID: OK2005501) - request the latest Consumer Confidence Report or ask about specific contaminants.