Is Allen, OK Tap Water Safe to Drink?
Graded A-, with 4 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
86.4/100
waterverge.com Allen, OK — Water Quality Report
Allen's drinking water received a grade of A- (86.4 out of 100), indicating good water quality. The city's 2 water systems serve approximately 3,117 residents using groundwater.
Lead levels were measured at 2.2 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 14 violations on record, including 5 health-based violations. 4 remain unresolved.
What to know about Allen's water
Allen ranks #34 out of 358 cities in Oklahoma for water quality, placing it one of the best in the state.
Allen 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.
As a small community water system, Allen may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Allen, OK water safe to drink?
Allen's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (86.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 3,117 residents using groundwater (wells).
Recent water quality updates for Allen
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Allen's water quality assessment. Grade: A- (86.4/100).
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: Coliform (TCR).
1 health-based. Contaminants: Coliform (TCR).
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 Allen's water supply.
Well within EPA limits.
Violation history
Allen's water system has 14 total violations on record, including 5 health-based violations. 4 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Pontotoc County has experienced 1 federally declared disaster since 2005. 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 Little River Near Sasakwa.
Where does Allen's water come from?
Allen's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 3,117 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Little River Near Sasakwa (river).
What Allen residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Allen'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
Drought conditions
D1 — moderate droughtHughes 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
Pontotoc County has experienced 1 federally declared disaster since 2005. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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. | 2.2 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Allen compares by contaminant
Explore where Allen ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Allen's water comes from
Allen'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 3,117 people through 2 water systems.
Water bodies near Allen
Allen is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Allen
| System Name | PWSID | Population | Source |
|---|---|---|---|
| HUGHES CO. RWD #6 (GERTY) | OK2003224 | 2,180 | GW |
| ALLEN PWA | OK2006202 | 937 | GW |
How Allen compares
Full Oklahoma rankings →Allen's score of 86.4/100 is above the average of 45/100 among major Oklahoma cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Allen, OK
Wikipedia →Allen is a town in Hughes and Pontotoc counties in the U.S. state of Oklahoma. The population was 805 at the 2020 census.
Learn more about your water
Guides and resources related to Allen's water quality findings.
Explore water quality across Hughes
Frequently asked questions
Is Allen, OK tap water safe to drink?
Allen's water quality earned a grade of A- (86.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #34 out of 358 cities tested in Oklahoma.
What contaminants are in Allen's water?
Lead was measured at 2.2 ppb (90th percentile). 14 violations are on record.
How is Allen'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 Allen?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Allen's water come from?
Allen's water is sourced from Groundwater. The city has 2 water systems serving approximately 3,117 residents.
What health violations has Allen's water system had?
Allen has 5 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 4 violations remain unresolved.
Is Allen's groundwater at risk of contamination?
Allen 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 14 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 Allen's water compare to other cities?
Allen ranks #34 out of 358 cities in Oklahoma (better than 91% of state cities) and #4708 out of 15744 cities nationally (70th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.