Is Lexington, OK Tap Water Safe to Drink?
Graded F — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
42/100
waterverge.com Lexington, OK — Water Quality Report
Lexington's drinking water received a grade of F (42 out of 100), indicating failing water quality. The city's 3 water systems serve approximately 5,166 residents using groundwater.
Lead levels were measured at 6.5 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 262 violations on record, including 16 health-based violations. 14 remain unresolved.
What to know about Lexington's water
Lexington ranks #342 out of 358 cities in Oklahoma for water quality, placing it among the lowest-rated in the state.
Lexington relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection.
The system has seen 47 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Lexington, OK water safe to drink?
Lexington's drinking water has significant quality concerns based on EPA testing data. With a grade of F (42/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 5,166 residents using groundwater (wells).
Recent water quality updates for Lexington
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Lexington's water quality assessment. Grade: F (42/100).
Contaminants: Chlorine, Revised Total Coliform Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Combined Radium (-226 and -228), Gross Alpha, Excl. Radon and U, Combined Uranium.
Federal disaster declaration (FEMA DR-3219). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-778). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Lexington's water supply.
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb. An NSF 53-certified filter provides additional protection.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Lexington's water system has 262 total violations on record, including 16 health-based violations. 14 remain unresolved. 47 violations were issued in the last 5 years.
Flood & environmental risk
Cleveland County has experienced 4 federally declared disasters since 1973. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Canadian River At Purcell, Walnut Creek At Purcell.
Where does Lexington's water come from?
Lexington's drinking water comes from groundwater (wells), supplied by 3 water systems serving approximately 5,166 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Canadian River At Purcell (river), Walnut Creek At Purcell (river).
What Lexington residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Lexington's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Lexington's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Lexington
Industrial polluters nearby
Reported releases to surface water by facilities near Lexington, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
ML PRODUCTS LLC NOBLE, OK73068 | — | — | 8.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtCleveland County is currently in D3 (extreme drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Cleveland County has experienced 4 federally declared disasters since 1973. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Lexington's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 6.5 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.42 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Lexington compares by contaminant
Explore where Lexington ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Lexington's water comes from
Lexington's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by state ownership and serves approximately 5,166 people through 3 water systems.
Water bodies near Lexington
Lexington is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Lexington
| System Name | PWSID | Population | Source |
|---|---|---|---|
| JOSEPH HARP CORR INST | OK2001408 | 3,000 | GW |
| LEXINGTON | OK2001409 | 2,086 | GW |
| CLEVELAND CO RW,S,G&SWMD #1 | OK4001499 | 80 | GW |
How Lexington compares
Full Oklahoma rankings →Lexington's score of 42/100 is on par with the average of 45/100 among major Oklahoma cities. It outscores 5 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Lexington, OK
Learn more about your water
Guides and resources related to Lexington's water quality findings.
Explore water quality across Cleveland
Frequently asked questions
Is Lexington, OK tap water safe to drink?
Lexington's water quality earned a grade of F (42/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #342 out of 358 cities tested in Oklahoma.
What contaminants are in Lexington's water?
Lead was measured at 6.5 ppb (90th percentile). 262 violations are on record.
How is Lexington's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Lexington?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lexington's water come from?
Lexington's water is sourced from Groundwater. The city has 3 water systems serving approximately 5,166 residents.
What health violations has Lexington's water system had?
Lexington has 16 health-based violations on record. The most recent violation was recorded in November 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 14 violations remain unresolved.
Is Lexington's groundwater at risk of contamination?
Lexington uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 262 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Lexington's water compare to other cities?
Lexington ranks #342 out of 358 cities in Oklahoma (better than 4% of state cities) and #14883 out of 15744 cities nationally (6th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.