Is Mannsville, OK Tap Water Safe to Drink?
Graded A- — but Chlorate was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
87.8/100
waterverge.com Mannsville, OK — Water Quality Report
Mannsville's drinking water received a grade of A- (87.8 out of 100), indicating good water quality. The city's 1 water system serves approximately 587 residents using groundwater.
Lead levels were measured at 5.9 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 72 violations on record, including 4 health-based violations. 10 remain unresolved.
What to know about Mannsville's water
Mannsville ranks #26 out of 358 cities in Oklahoma for water quality, placing it one of the best in the state.
Mannsville 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.
Hexavalent chromium (chromium-6) was detected at 0.41 µg/L in UCMR 3 testing. While below California's 10 µg/L limit and with no federal MCL set, residents sensitive to this contaminant may consider reverse osmosis filtration.
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.
As a small community water system, Mannsville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Mannsville, OK water safe to drink?
Mannsville's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (87.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 587 residents using groundwater (wells).
Recent water quality updates for Mannsville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Mannsville's water quality assessment. Grade: A- (87.8/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Revised Total Coliform Rule.
Contaminants: Chlorine.
Federal disaster declaration (FEMA DR-1754). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3219). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Mannsville'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.
Violation history
Mannsville's water system has 72 total violations on record, including 4 health-based violations. 10 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Johnston County has experienced 3 federally declared disasters since 1981. 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 Washita River Near Dickson.
Where does Mannsville's water come from?
Mannsville's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 587 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Washita River Near Dickson (river).
What Mannsville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Mannsville'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.
Mannsville'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 Mannsville
Industrial polluters nearby
Reported releases to surface water by facilities near Mannsville, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CM TRUCK BEDS - MADILL MADILL, OK73446 | — | — | 8.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D1 — moderate droughtJohnston 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.
Flood & disaster history
Johnston County has experienced 3 federally declared disasters since 1981. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Mannsville'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. | 5.9 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Mannsville compares by contaminant
Explore where Mannsville ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Mannsville's water comes from
Mannsville'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 local government ownership and serves approximately 587 people through 1 water system.
Water bodies near Mannsville
Mannsville is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Mannsville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| MANNSVILLE PUBLIC WORKS AUTHORITY | OK2003505 | 587 | GW |
How Mannsville compares
Full Oklahoma rankings →Mannsville's score of 87.8/100 is above the average of 45/100 among major Oklahoma cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Mannsville, OK
Wikipedia →Mannsville is a town in Johnston County, Oklahoma, United States. The population was 728 as of the 2020 Census. The locale is old enough to appear on a 1911 Rand McNally map of the county.
Learn more about your water
Guides and resources related to Mannsville's water quality findings.
Explore water quality across Johnston
Frequently asked questions
Is Mannsville, OK tap water safe to drink?
Mannsville's water quality earned a grade of A- (87.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #26 out of 358 cities tested in Oklahoma.
What contaminants are in Mannsville's water?
Lead was measured at 5.9 ppb (90th percentile). 72 violations are on record.
How is Mannsville'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 Mannsville?
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 Mannsville's water come from?
Mannsville's water is sourced from Groundwater. The city has 1 water system serving approximately 587 residents.
What health violations has Mannsville's water system had?
Mannsville has 4 health-based violations on record. The most recent violation was recorded in October 2022. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 10 violations remain unresolved.
Is Mannsville's groundwater at risk of contamination?
Mannsville 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 72 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 Mannsville's water compare to other cities?
Mannsville ranks #26 out of 358 cities in Oklahoma (better than 93% of state cities) and #3850 out of 15744 cities nationally (76th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Mannsville's small water system affect quality?
Mannsville's system serves approximately 587 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 72 violations on record.