Is Knollwood, TX Tap Water Safe to Drink?
Graded A-, with 12 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
86.8/100
waterverge.com Knollwood, TX — Water Quality Report
Knollwood's drinking water received a grade of A- (86.8 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,353 residents using purchased surface water.
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 38 violations on record, including 0 health-based violations. 12 remain unresolved.
What to know about Knollwood's water
Knollwood ranks #139 out of 1067 cities in Texas for water quality, placing it above 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.
As a small community water system, Knollwood may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Knollwood, TX water safe to drink?
Knollwood's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (86.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,353 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Knollwood
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Knollwood's water quality assessment. Grade: A- (86.8/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Revised Total Coliform Rule.
Contaminants: Revised Total Coliform 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 Knollwood's water supply.
Well within EPA limits.
Violation history
Knollwood's water system has 38 total violations on record, including 0 health-based violations. 12 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 Red Rv At Denison Dam Nr Denison.
Where does Knollwood's water come from?
Knollwood's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 1,353 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Red Rv At Denison Dam Nr Denison (river).
What Knollwood residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Knollwood'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
Top industrial polluters within 10 miles of Knollwood
Industrial polluters nearby
Reported releases to surface water by facilities near Knollwood, ranked by pounds discharged annually.
Total reported releases to surface water: 177 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
AAAR DENISON I DENISON, TX75020 | Zinc compounds | 175 | 7.4 mi |
DENISON INDUSTRIES DENISON, TX75020 | Copper | 1 | 3.2 mi |
KAISER ALUMINUM FABRICATED PRODUCTS LLC SHERMAN, TX75090 | Lead | 0 | 0.8 mi |
FLORESTONE LLC DENISON, TX75020 | — | — | 7.8 mi |
AAAR DENISON II DENISON, TX75020 | — | — | 6.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
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 (90th percentile)
Latest reading: 0.0 ppb (2023)
EPA action level: 15 ppb
See how Knollwood compares by contaminant
Explore where Knollwood ranks among all Texas cities for specific contaminants.
Water source & infrastructure
Where Knollwood's water comes from
Knollwood's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
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 1,353 people through 1 water system.
Water bodies near Knollwood
Knollwood is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Knollwood
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CITY OF KNOLLWOOD | TX0910146 | 1,353 | SWP |
How Knollwood compares
Full Texas rankings →Knollwood's score of 86.8/100 is above the average of 46/100 among major Texas cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Texas rankings →About Knollwood, TX
Learn more about your water
Guides and resources related to Knollwood's water quality findings.
Explore water quality across Grayson
Frequently asked questions
Is Knollwood, TX tap water safe to drink?
Knollwood's water quality earned a grade of A- (86.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #139 out of 1067 cities tested in Texas.
What contaminants are in Knollwood's water?
Lead was measured at 0.0 ppb (90th percentile). 38 violations are on record.
How is Knollwood'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 Knollwood?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Knollwood's water come from?
Knollwood's water is sourced from Purchased surface water. The city has 1 water system serving approximately 1,353 residents.
How does Knollwood's water compare to other cities?
Knollwood ranks #139 out of 1067 cities in Texas (better than 87% of state cities) and #4467 out of 15744 cities nationally (72th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Knollwood's small water system affect quality?
Knollwood's system serves approximately 1,353 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 38 violations on record.