Is Tioga, TX Tap Water Safe to Drink?
Graded A-, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
86.1/100
waterverge.com Tioga, TX — Water Quality Report
Tioga's drinking water received a grade of A- (86.1 out of 100), indicating good water quality. The city's 1 water system serves approximately 938 residents using groundwater.
Lead levels were measured at 0.0 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 4 violations on record, including 0 health-based violations. 3 remain unresolved.
What to know about Tioga's water
Tioga ranks #168 out of 1067 cities in Texas for water quality, placing it above average in the state.
Tioga 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, Tioga may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Tioga, TX water safe to drink?
Tioga's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (86.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 938 residents using groundwater (wells).
Recent water quality updates for Tioga
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Tioga's water quality assessment. Grade: A- (86.1/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-3294). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-1606). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Tioga's water supply.
Well within EPA limits.
Violation history
Tioga's water system has 4 total violations on record, including 0 health-based violations. 3 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Grayson County has experienced 2 federally declared disasters 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 Timber Ck Nr Collinsville, Range Ck Nr Collinsville, Ray Roberts Lk Nr Pilot Point, Elm Fk Trinity Rv At Greenbelt Nr Pilot Point, Ray Roberts Lk Site Ac Nr Pilot Point.
Where does Tioga's water come from?
Tioga's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 938 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Timber Ck Nr Collinsville (river), Range Ck Nr Collinsville (river), Ray Roberts Lk Nr Pilot Point (lake), Elm Fk Trinity Rv At Greenbelt Nr Pilot Point (river), Ray Roberts Lk Site Ac Nr Pilot Point (lake).
What Tioga residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Tioga'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 droughtGrayson 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
Grayson County has experienced 2 federally declared disasters 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Tioga compares by contaminant
Explore where Tioga ranks among all Texas cities for specific contaminants.
Water source & infrastructure
Where Tioga's water comes from
Tioga'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 938 people through 1 water system.
Water bodies near Tioga
Tioga is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Tioga
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CITY OF TIOGA | TX0910007 | 938 | GW |
How Tioga compares
Full Texas rankings →Tioga's score of 86.1/100 is above the average of 46/100 among major Texas cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Texas rankings →About Tioga, TX
Wikipedia →Tioga is a town in Grayson County, Texas, United States. The population was 1,142 at the 2020 census. It is part of the Sherman–Denison Metropolitan Statistical Area.
Learn more about your water
Guides and resources related to Tioga's water quality findings.
Explore water quality across Grayson
Frequently asked questions
Is Tioga, TX tap water safe to drink?
Tioga's water quality earned a grade of A- (86.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #168 out of 1067 cities tested in Texas.
What contaminants are in Tioga's water?
Lead was measured at 0.0 ppb (90th percentile). 4 violations are on record.
How is Tioga'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 Tioga?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Tioga's water come from?
Tioga's water is sourced from Groundwater. The city has 1 water system serving approximately 938 residents.
Is Tioga's groundwater at risk of contamination?
Tioga 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 4 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 Tioga's water compare to other cities?
Tioga ranks #168 out of 1067 cities in Texas (better than 84% of state cities) and #4942 out of 15744 cities nationally (69th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Tioga's small water system affect quality?
Tioga's system serves approximately 938 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 4 violations on record.