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WaterSafeCheck

ZIP Code 73118 Water Quality Report

Oklahoma City, OK · Oklahoma County County

Safety Score
B

Water Safety Grade

Good — Minor issues on record

Health Violations

0

Total Violations

2

Lead Risk

High

Contaminants

0

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Active Water Quality Issues Detected

EPA records show 2 unresolved violations. Contact Oklahoma City for current status.

About Tap Water in ZIP Code 73118

Tap water in ZIP code 73118 (Oklahoma City, OK) meets all federal safety standards and earns a solid B grade (score: 81/100). Served by Oklahoma City, the water system has maintained general compliance with EPA Safe Drinking Water Act regulations, with only minor issues on record.

Water System

Oklahoma City

EPA ID: OK1020902

Water Source

Surface Water

Population Served

644,000 residents

County

Oklahoma County County, Oklahoma

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Lead Levels in ZIP 73118

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 4.1 ppb — Very Low

The 90th percentile lead level in 73118 is 4.1 ppb, well below the EPA action level of 15 ppb. While this is a reassuring result, the EPA's public health goal for lead is actually zero — no amount of lead is considered completely safe, particularly for children under 6 and pregnant women. Running your tap for 30 seconds before use and using a certified NSF/ANSI 53 filter adds an extra layer of protection.

Lead exposure risk in 73118 is rated High. EPA models estimate a 68% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This typically reflects older housing stock built before 1986 (when lead pipes were banned), aging distribution infrastructure, or detected lead levels in water samples. Families should prioritize getting their tap water tested independently and installing a certified lead-reducing filter.

Lead Level (90th percentile)
4.10 ppb (0.0041 mg/L)
Lead (Consumer Confidence Report)

From annual CCR filing

4.1 ppb
Copper (Consumer Confidence Report)

From annual CCR filing

0.2 ppb
Lead Exposure Risk Rating
High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

68%
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Violation History

Past 5 years — EPA SDWIS data

Oklahoma City has recorded 2 violations, but none are health-based. Administrative or reporting violations don't directly indicate unsafe water, but they do signal gaps in documentation or monitoring procedures. 2 violations are currently unresolved — meaning the issue has not yet been formally corrected in EPA records. This is a serious concern that residents should follow up on with their water utility.

Total Violations (5 yr)
2
Health-Based Violations
0
Unresolved Violations
2
Boil Water Advisories
0
Compliance Risk
High

Regulatory compliance risk is rated High. Oklahoma City has a pattern of compliance issues that goes beyond isolated incidents. Residents should stay informed via their utility's Consumer Confidence Report.

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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 73118. This means EPA monitoring has not found levels of regulated contaminants exceeding the Maximum Contaminant Levels (MCLs) set under the Safe Drinking Water Act — a positive indicator of water quality compliance.

From Consumer Confidence Report:

TOTAL HALOACETIC ACIDS (HAA5) (36 ppb); TTHM (69 ppb); COMBINED RADIUM (-226 & -228) (3 pCi/L)

⚖ Enforcement Actions

10 enforcement actions have been issued against Oklahoma City — a high number that reflects sustained compliance struggles. Enforcement actions escalate from administrative orders to financial penalties when utilities repeatedly fail to meet safe drinking water standards.
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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type
Surface Water
CCR Source Classification
Lake Hefner, Lake Atoka, Draper Lake (Surface Water)
EPA Radon Zone

Lower potential

Zone 3
Annual Flood Risk Cost

Estimated annual flood-related costs per property

$3
Energy Burden

% of household income spent on energy — indicator of older infrastructure

2.4%

EPA Radon Zone 3 — lower radon potential, though the EPA still recommends testing all homes.

🛡 What Should You Do? — ZIP 73118 Recommendations

  • ✓ Run cold water for 30 seconds each morning before use — especially if pipes are old
  • ✓ Request your annual Consumer Confidence Report from Oklahoma City
  • ✓ If your home was built before 1986, consider testing your own tap for lead
  • ✓ Use a pitcher filter (NSF/ANSI 42 certified) for improved taste

Frequently Asked Questions — ZIP 73118 Water Quality

Is tap water safe to drink in ZIP code 73118?+
Yes — tap water in 73118 (Oklahoma City, OK) currently meets all federal EPA standards with a water safety grade of B. No health-based violations are on record in the past 5 years. You can drink your tap water with confidence, though running the tap for 30 seconds in the morning is always a good practice.
What is the lead level in 73118 tap water?+
The 90th percentile lead level in 73118 is 4.1 ppb (parts per billion). The EPA action level is 15 ppb. This is a low level, well below the EPA action level of 15 ppb.
Who provides tap water to 73118?+
Tap water in ZIP code 73118 is provided by Oklahoma City (EPA ID: OK1020902). This system serves approximately 644,000 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 73118?+
ZIP code 73118 is served by surface water. Surface water systems draw from rivers, lakes, or reservoirs and must meet strict EPA treatment requirements including filtration and disinfection.
Does 73118 have any active water quality violations?+
Yes — there are currently 2 unresolved violations on record for this water system. Unresolved violations indicate issues that have not yet been formally corrected in EPA tracking systems. Contact Oklahoma City for the latest update.
How do I get a copy of my water quality report for 73118?+
Your water utility — Oklahoma City — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "Oklahoma City Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 73118?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 73118, with a clean compliance record, a standard carbon block filter meeting NSF/ANSI 42 is a good choice for taste and as a precaution.
Is 73118 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 73118 shows a lead level of 4.1 ppb — below the action level, but as an extra precaution, run your tap for 30 seconds before use and consider a certified lead filter for infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 73118 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Oklahoma City. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →