01The verdict: is Atoka water safe?
Atoka's drinking water has significant quality concerns based on EPA testing data. With a grade of D+ (50.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 7,313 residents using surface water (rivers, lakes, or reservoirs).
Manganese is over its legal limit
Measured at 190.0 µg/L against the EPA Secondary MCL of 50 µg/L. The ledger below shows how far over — and which filter removes it.
See the measurement ↓Lead is well under the limit
90th-percentile lead is 0.5 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓HAA5 is approaching its limit
Measured at 45.6 µg/L — 76% of the 60 µg/L limit. Within the rules, but with less headroom than you'd want.
See the ledger ↓Atoka's drinking water received a grade of D+ (50.1 out of 100), indicating poor water quality. The city's 4 water systems serve approximately 7,313 residents using surface water.
Lead levels were measured at 0.5 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 380 violations on record, including 269 health-based violations. 18 remain unresolved.
Atoka ranks #212 out of 357 cities in Oklahoma for water quality, placing it below average 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. Haloacetic acid (HAA5) levels were elevated at 45.6 µg/L in UCMR 4 testing, though below the 60 µg/L EPA limit. Activated carbon filtration can help reduce these disinfection byproducts. The system has seen 102 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
02What's in Atoka's water
Every contaminant flagged in Atoka, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
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. | 0.5 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Oklahoma
Cities ranked by compounds detected Cu Copper in Oklahoma
Cities ranked by 90th-percentile copper
03Atoka's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 380 violations on record, including 269 health-based violations. 18 remain unresolved.
2 of the last ten years were clean. The numbered years had EPA violations — red when any were health-based, amber when they were paperwork or missed-testing issues.
▼ Down 8.5 ppb since 1993. Latest reading: 0.50 ppb (2025) — 3% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Atoka's water comes from
Atoka's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Local treatment
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
4 systems
4 water systems, operated under local government ownership.
7,313 people
Residents served across Atoka's service area.
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 7,313 people through 4 water systems.
| System name | PWSID | Population | Source |
|---|---|---|---|
| ATOKA CO. RWS & SWMD #4 | OK1010412 | 3,000 | Surface Water |
| ATOKA | OK1010401 | 2,988 | Surface Water |
| HOWARD MCLEOD CORRECTIONAL CENTER | OK2000304 | 825 | Groundwater |
| ATOKA CO. RWD #2 | OK3000306 | 500 | Purchased Surface Water |
Water bodies near Atoka
As a surface-water system, these water bodies may directly influence Atoka's drinking water supply.
05Pressure on Atoka's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
3 federal disaster declarations on record for Atoka County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Atoka compares
Scores for nearby Oklahoma cities on one line, with the average marked.
dashed line = Oklahoma average (45/100)
Atoka scores 50.1/100 — above the Oklahoma average of 45/100. It outscores 9 of 10 nearby cities. Full Oklahoma rankings →
38.6 / 100DTulsa, OK
48.5 / 100FBroken Arrow, OK
43.9 / 100FNorman, OK
38.4 / 100FLawton, OK
44.4 / 100FEdmond, OK
34.9 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Atoka's water — not generic advice.
A basic carbon filter still helps
Atoka's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Atoka alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Atoka, OK tap water safe to drink?
Atoka's water quality earned a grade of D+ (50.1/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #212 out of 357 cities tested in Oklahoma.
What contaminants are in Atoka's water?
Lead was measured at 0.5 ppb (90th percentile). 380 violations are on record.
How is Atoka'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 Atoka?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Atoka's water come from?
Atoka's water is sourced from Surface water. The city has 4 water systems serving approximately 7,313 residents.
What health violations has Atoka's water system had?
Atoka has 269 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. 18 violations remain unresolved.
How does Atoka's water compare to other cities?
Atoka ranks #212 out of 357 cities in Oklahoma (better than 41% of state cities) and #12808 out of 15382 cities nationally (17th percentile). The grade of D+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.