Is Cyril, OK Tap Water Safe to Drink?
Graded B, with 7 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
79.7/100
waterverge.com Cyril, OK — Water Quality Report
Cyril's drinking water received a grade of B (79.7 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,168 residents using purchased ground water.
Lead levels were measured at 1.8 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 18 violations on record, including 1 health-based violation. 7 remain unresolved.
What to know about Cyril's water
Cyril ranks #83 out of 358 cities in Oklahoma for water quality, placing it above average in the state.
Cyril purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition.
As a small community water system, Cyril may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 8 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Cyril, OK water safe to drink?
Cyril's drinking water has significant quality concerns based on EPA testing data. With a grade of B (79.7/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,168 residents using groundwater (wells).
Recent water quality updates for Cyril
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Cyril's water quality assessment. Grade: B (79.7/100).
Contaminants: Chlorine, Revised Total Coliform Rule.
Contaminants: Chlorine.
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-4274). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-1754). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Cyril's water supply.
Well within EPA limits.
Violation history
Cyril's water system has 18 total violations on record, including 1 health-based violation. 7 remain unresolved. 8 violations were issued in the last 5 years.
Flood & environmental risk
Caddo County has experienced 7 federally declared disasters since 1982. 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 Washita River Near Cyril, Little Washita River Near Cement.
Where does Cyril's water come from?
Cyril's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,168 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 Washita River Near Cyril (river), Little Washita River Near Cement (river).
What Cyril residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Cyril'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.
Cyril'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 Cyril
Industrial polluters nearby
Reported releases to surface water by facilities near Cyril, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
GEORGIA-PACIFIC GYPSUM LLC FLETCHER, OK73541 | — | — | 6.2 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Cyril
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- OKLAHOMA REFINING CO0.5 mi
Source: EPA Superfund National Priorities List
Drought conditions
D3 — extreme droughtCaddo 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
Caddo County has experienced 7 federally declared disasters since 1982. 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. | 1.8 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Cyril compares by contaminant
Explore where Cyril ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Cyril's water comes from
Cyril purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Water quality depends on both the wholesaler's treatment standards and the condition of Cyril's local distribution pipes and storage facilities.
Purchased water systems are common in suburban areas and smaller communities that lack the infrastructure for independent treatment.
The system is operated by local government ownership and serves approximately 1,168 people through 1 water system.
Water bodies near Cyril
Cyril is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Cyril
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CYRIL | OK3000805 | 1,168 | GWP |
How Cyril compares
Full Oklahoma rankings →Cyril's score of 79.7/100 is above the average of 45/100 among major Oklahoma cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Cyril, OK
Learn more about your water
Guides and resources related to Cyril's water quality findings.
Explore water quality across Caddo
Frequently asked questions
Is Cyril, OK tap water safe to drink?
Cyril's water quality earned a grade of B (79.7/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #83 out of 358 cities tested in Oklahoma.
What contaminants are in Cyril's water?
Lead was measured at 1.8 ppb (90th percentile). 18 violations are on record.
How is Cyril'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 Cyril?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Cyril's water come from?
Cyril's water is sourced from Purchased ground water. The city has 1 water system serving approximately 1,168 residents.
What health violations has Cyril's water system had?
Cyril has 1 health-based violation on record. The most recent violation was recorded in May 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 7 violations remain unresolved.
Is Cyril's groundwater at risk of contamination?
Cyril 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 18 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 Cyril's water compare to other cities?
Cyril ranks #83 out of 358 cities in Oklahoma (better than 77% of state cities) and #8168 out of 15744 cities nationally (48th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Cyril's small water system affect quality?
Cyril's system serves approximately 1,168 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 18 violations on record.