Is Grayson, LA Tap Water Safe to Drink?
Graded D, with 65 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
45/100
waterverge.com Grayson, LA — Water Quality Report
Grayson's drinking water received a grade of D (45 out of 100), indicating poor water quality. The city's 4 water systems serve approximately 4,476 residents using groundwater.
Lead levels were measured at 0.8 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 135 violations on record, including 70 health-based violations. 65 remain unresolved.
What to know about Grayson's water
Grayson ranks #241 out of 309 cities in Louisiana for water quality, placing it among the lowest-rated in the state.
Grayson 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.
The system has seen 41 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Grayson, LA water safe to drink?
Grayson's drinking water has significant quality concerns based on EPA testing data. With a grade of D (45/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 4,476 residents using groundwater (wells).
Recent water quality updates for Grayson
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Grayson's water quality assessment. Grade: D (45/100).
2 health-based. Contaminants: TTHM.
2 health-based. Contaminants: TTHM.
3 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS, TTHM.
Key contaminant findings
Based on the most recent EPA sampling data for Grayson's water supply.
Well within EPA limits.
Violation history
Grayson's water system has 135 total violations on record, including 70 health-based violations. 65 remain unresolved. 41 violations were issued in the last 5 years.
Where does Grayson's water come from?
Grayson's drinking water comes from groundwater (wells), supplied by 4 water systems serving approximately 4,476 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Bayou Lafourche At Hwy 847 East Of Cane Hill (river), Castor Ck Nr Grayson (river).
What Grayson residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Grayson'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 droughtCaldwell Parish 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.
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. | 0.8 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Grayson compares by contaminant
Explore where Grayson ranks among all Louisiana cities for specific contaminants.
Water source & infrastructure
Where Grayson's water comes from
Grayson'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 4,476 people through 4 water systems.
Water bodies near Grayson
Grayson is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Grayson
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GRAYSON WATER SYSTEM | LA1021005 | 1,461 | GW |
| HOLUM WATER SYSTEM | LA1021007 | 1,230 | GW |
| WARDS 4 & 5 WATER SYSTEM | LA1021010 | 1,002 | GW |
| COTTON PLANT WATER SYSTEM | LA1021009 | 783 | GW |
How Grayson compares
Full Louisiana rankings →Grayson's score of 45/100 is below the average of 53/100 among major Louisiana cities. It outscores 6 of 10 nearby cities.
Nearby cities
View Louisiana rankings →About Grayson, LA
Wikipedia →Grayson is a village in Caldwell Parish, Louisiana, United States. As of the 2020 census, Grayson had a population of 449.
Learn more about your water
Guides and resources related to Grayson's water quality findings.
Explore water quality across Caldwell Parish
Frequently asked questions
Is Grayson, LA tap water safe to drink?
Grayson's water quality earned a grade of D (45/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #241 out of 309 cities tested in Louisiana.
What contaminants are in Grayson's water?
Lead was measured at 0.8 ppb (90th percentile). 135 violations are on record.
How is Grayson'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 Grayson?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Grayson's water come from?
Grayson's water is sourced from Groundwater. The city has 4 water systems serving approximately 4,476 residents.
What health violations has Grayson's water system had?
Grayson has 70 health-based violations on record. The most recent violation was recorded in April 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 65 violations remain unresolved.
Is Grayson's groundwater at risk of contamination?
Grayson 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 135 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 Grayson's water compare to other cities?
Grayson ranks #241 out of 309 cities in Louisiana (better than 22% of state cities) and #14244 out of 15744 cities nationally (10th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.