Is Monroe, OK Tap Water Safe to Drink?
Graded B-, with 13 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
73.6/100
waterverge.com Monroe, OK — Water Quality Report
Monroe's drinking water received a grade of B- (73.6 out of 100), indicating fair water quality. The city's 1 water system serves approximately 1,800 residents using purchased surface water.
Lead levels were measured at 1.2 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 69 violations on record, including 12 health-based violations. 13 remain unresolved.
What to know about Monroe's water
Monroe ranks #111 out of 358 cities in Oklahoma for water quality, placing it mid-range in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Monroe may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 10 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Monroe, OK water safe to drink?
Monroe's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (73.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,800 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Monroe
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Monroe's water quality assessment. Grade: B- (73.6/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Contaminants: Chlorine, Revised Total Coliform Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Monroe's water supply.
Well within EPA limits.
Violation history
Monroe's water system has 69 total violations on record, including 12 health-based violations. 13 remain unresolved. 10 violations were issued in the last 5 years.
Where does Monroe's water come from?
Monroe's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 1,800 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Poteau River At Loving (river).
What Monroe residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Monroe'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.
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 Monroe
Industrial polluters nearby
Reported releases to surface water by facilities near Monroe, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
OK FOODS INC-HEAVENER (BACHOCO USA) HEAVENER, OK74937 | — | — | 7.6 mi |
OK FOODS INC-HEAVENER FEED MILL HEAVENER, OK74937 | — | — | 9.2 mi |
OLDCASTLE INFRASTRUCTURE INC POTEAU, OK74953 | — | — | 7.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D1 — moderate droughtLe Flore County is currently in D1 (moderate 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.
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. | 1.2 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Monroe compares by contaminant
Explore where Monroe ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Monroe's water comes from
Monroe's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 1,800 people through 1 water system.
Water bodies near Monroe
Monroe is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Monroe
| System Name | PWSID | Population | Source |
|---|---|---|---|
| LEFLORE CO. CONSOLIDATED RWD #12 | OK3004040 | 1,800 | SWP |
How Monroe compares
Full Oklahoma rankings →Monroe's score of 73.6/100 is above the average of 45/100 among major Oklahoma cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Monroe, OK
Wikipedia →Monroe is an unincorporated community and census-designated place in far eastern Le Flore County, Oklahoma, United States.
Learn more about your water
Guides and resources related to Monroe's water quality findings.
Explore water quality across Le Flore
Frequently asked questions
Is Monroe, OK tap water safe to drink?
Monroe's water quality earned a grade of B- (73.6/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #111 out of 358 cities tested in Oklahoma.
What contaminants are in Monroe's water?
Lead was measured at 1.2 ppb (90th percentile). 69 violations are on record.
How is Monroe'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 Monroe?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Monroe's water come from?
Monroe's water is sourced from Purchased surface water. The city has 1 water system serving approximately 1,800 residents.
What health violations has Monroe's water system had?
Monroe has 12 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 13 violations remain unresolved.
How does Monroe's water compare to other cities?
Monroe ranks #111 out of 358 cities in Oklahoma (better than 69% of state cities) and #10049 out of 15744 cities nationally (36th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Monroe's small water system affect quality?
Monroe's system serves approximately 1,800 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 69 violations on record.