Is Granite, OK Tap Water Safe to Drink?
Graded D+, with 17 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
53.8/100
waterverge.com Granite, OK — Water Quality Report
Granite's drinking water received a grade of D+ (53.8 out of 100), indicating poor water quality. The city's 2 water systems serve approximately 2,424 residents using purchased ground 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 156 violations on record, including 91 health-based violations. 17 remain unresolved.
What to know about Granite's water
Granite ranks #173 out of 358 cities in Oklahoma for water quality, placing it mid-range in the state.
Granite 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, Granite may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 22 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Granite, OK water safe to drink?
Granite's drinking water has significant quality concerns based on EPA testing data. With a grade of D+ (53.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,424 residents using groundwater (wells).
Recent water quality updates for Granite
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Granite's water quality assessment. Grade: D+ (53.8/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Chlorine, Revised Total Coliform Rule.
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS, Lead and Copper Rule.
Federal disaster declaration (FEMA DR-3219). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-778). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Granite's water supply.
Well within EPA limits.
Violation history
Granite's water system has 156 total violations on record, including 91 health-based violations. 17 remain unresolved. 22 violations were issued in the last 5 years.
Flood & environmental risk
Greer County has experienced 2 federally declared disasters since 1986. 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 Salt Fork Red River At Mangum, Lake Altus At Lugert, Lugert Drainage Ditch At Lugert, North Fork Red River Blw Altus Dam Nr Lugert.
Where does Granite's water come from?
Granite's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 2,424 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Salt Fork Red River At Mangum (river), Lake Altus At Lugert (lake), Lugert Drainage Ditch At Lugert (stream), North Fork Red River Blw Altus Dam Nr Lugert (river).
What Granite residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Granite'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
D3 — extreme droughtGreer 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
Greer County has experienced 2 federally declared disasters since 1986. 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. | 1.2 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Granite compares by contaminant
Explore where Granite ranks among all Oklahoma cities for specific contaminants.
Water source & infrastructure
Where Granite's water comes from
Granite 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 Granite'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 2,424 people through 2 water systems.
Water bodies near Granite
Granite is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Granite
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GRANITE PWS | OK2002804 | 1,425 | GWP |
| OKLAHOMA STATE REFORMATORY | OK2002803 | 999 | GWP |
How Granite compares
Full Oklahoma rankings →Granite's score of 53.8/100 is above the average of 45/100 among major Oklahoma cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Oklahoma rankings →About Granite, OK
Learn more about your water
Guides and resources related to Granite's water quality findings.
Explore water quality across Greer
Frequently asked questions
Is Granite, OK tap water safe to drink?
Granite's water quality earned a grade of D+ (53.8/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #173 out of 358 cities tested in Oklahoma.
What contaminants are in Granite's water?
Lead was measured at 1.2 ppb (90th percentile). 156 violations are on record.
How is Granite'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 Granite?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Granite's water come from?
Granite's water is sourced from Purchased ground water. The city has 2 water systems serving approximately 2,424 residents.
What health violations has Granite's water system had?
Granite has 91 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 17 violations remain unresolved.
Is Granite's groundwater at risk of contamination?
Granite 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 156 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 Granite's water compare to other cities?
Granite ranks #173 out of 358 cities in Oklahoma (better than 52% of state cities) and #12656 out of 15744 cities nationally (20th percentile). The grade of D+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.