What was found in Grayson's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 700 µg/L 54% of the EPA limit 1300 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 1360 µg/L — WARDS 4 & 5 WATER SYSTEM · 1,002 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 1000 µg/L 10% of the EPA limit 10000 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 3/4 | SYR4 |
| Fluoride | 476 µg/L 12% of the EPA limit 4000 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 4/4 | SYR4 |
| Barium | 50.75 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 244 µg/L — COTTON PLANT WATER SYSTEM · 783 people · 2017 | 4/4 | SYR4 |
| TTHM | 51.44 µg/L 64% of the EPA limit 80 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 121.24 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Chloroform | 7.79 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 71.43 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12.975 µg/L 22% of the EPA limit 60 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 68.9 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 3.6 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 44 µg/L — COTTON PLANT WATER SYSTEM · 783 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 15.93 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 37.06 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 4.675 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 26.005 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 19.97 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 4/4 | SYR4 |
| Bromoform | 12.09 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 14.34 µg/L — HOLUM WATER SYSTEM · 1,230 people · 2019 | 4/4 | SYR4 |
| Monobromoacetic Acid | 7.401 µg/L No EPA limit set Highest in the city: COTTON PLANT WATER SYSTEM · 783 people · 2019 | 2/4 | SYR4 |
| Gross Beta Particle Activity | 2.5495 pCi/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 6.877 pCi/L — COTTON PLANT WATER SYSTEM · 783 people · 2017 | 3/4 | SYR4 |
| Lead | 2 µg/L 13% of the EPA limit 15 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 4.8 µg/L — WARDS 4 & 5 WATER SYSTEM · 1,002 people · 2019 | 4/4 | SYR4 |
| Dibromoacetic Acid | 4.7 µg/L No EPA limit set Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 4.613 µg/L No EPA limit set Highest in the city: COTTON PLANT WATER SYSTEM · 783 people · 2019 | 3/4 | SYR4 |
| Arsenic | 2.19 µg/L 22% of the EPA limit 10 µg/L Highest in the city: WARDS 4 & 5 WATER SYSTEM · 1,002 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.26 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 3/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.5085 µg/L 8.5% of the EPA limit 6 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019
Highest in the city: 0.9780 µg/L — WARDS 4 & 5 WATER SYSTEM · 1,002 people · 2019 | 3/4 | SYR4 |
| Hexachlorobenzene | 0.1116 µg/L 11% of the EPA limit 1 µg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2019 | 2/4 | SYR4 |
| Lead | 0.00081 mg/L 5.4% of the EPA limit 0.0150 mg/L Main supplier: VILLAGE OF GRAYSON WATER SYSTEM · 1,461 people · 2025
Highest in the city: 0.0050 mg/L — WARDS 4 & 5 WATER SYSTEM · 1,002 people · 2024 | 4/4 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Grayson
| Supplier | Population served |
|---|---|
| VILLAGE OF GRAYSON WATER SYSTEM | 1,461 |
| HOLUM WATER SYSTEM | 1,230 |
| WARDS 4 & 5 WATER SYSTEM | 1,002 |
| COTTON PLANT WATER SYSTEM | 783 |
Frequently asked questions about Grayson tap water
Is Grayson tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Grayson. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Grayson?
4 public water suppliers report drinking-water monitoring for Grayson, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Grayson's water?
The contaminants EPA monitoring detected in Grayson include Copper, Nitrate-Nitrite, Fluoride, Barium, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.