Is Grayson, KY Tap Water Safe? Quality & Contaminants

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
Fluoride	880 µg/L 22% of the EPA limit 4000 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 1045 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2019	2/2	SYR4
Nitrate	270 µg/L 2.7% of the EPA limit 10000 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 310 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2019	2/2	SYR4
Nitrate-Nitrite	220 µg/L 2.2% of the EPA limit 10000 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2014 Highest in the city: 270 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2014	2/2	SYR4
Copper	81.25 µg/L 6.3% of the EPA limit 1300 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 130 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2019	2/2	SYR4
Total Haloacetic Acids (HAA5)	88.66 µg/L 148% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019	2/2	SYR4
TTHM	72.9 µg/L 91% of the EPA limit 80 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 82.85 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2019	2/2	SYR4
Barium	22.4 µg/L 1.1% of the EPA limit 2000 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 30.6 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2019	2/2	SYR4
Lead	1.255 µg/L 8.4% of the EPA limit 15 µg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2019 Highest in the city: 3.75 µg/L — GRAYSON UTILITY COMMISSION · 10,950 people · 2018	2/2	SYR4
Combined Radium (-226 And -228)	1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2014	2/2	SYR4
Total Polychlorinated Biphenyls (PCB)	0.1290 µg/L 26% of the EPA limit 0.5000 µg/L Highest in the city: GRAYSON UTILITY COMMISSION · 10,950 people · 2018	1/2	SYR4
Thallium, Total	0.1000 µg/L 5% of the EPA limit 2 µg/L Highest in the city: GRAYSON UTILITY COMMISSION · 10,950 people · 2019	1/2	SYR4
Hexachlorocyclopentadiene	0.0810 µg/L 0.2% of the EPA limit 50 µg/L Highest in the city: GRAYSON UTILITY COMMISSION · 10,950 people · 2018	1/2	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: RATTLESNAKE RIDGE WATER DISTRICT · 11,397 people · 2025	2/2	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
RATTLESNAKE RIDGE WATER DISTRICT	11,397
GRAYSON UTILITY COMMISSION	10,950

Frequently asked questions about Grayson tap water

Is Grayson tap water safe to drink?

EPA testing detected 13 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?

2 public water suppliers report drinking-water monitoring for Grayson, Kentucky 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 Fluoride, Nitrate, Nitrate-Nitrite, Copper, Total Haloacetic Acids (HAA5). 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.