Is Jefferson, LA Tap Water Safe? Quality & Contaminants

What was found in Jefferson'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
Nitrate-Nitrite	2200 µg/L 22% of the EPA limit 10000 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 2300 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Copper	416 µg/L 32% of the EPA limit 1300 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 786.8 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Fluoride	650 µg/L 16% of the EPA limit 4000 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
TTHM	77.1635 µg/L 96% of the EPA limit 80 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 83.6 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Total Haloacetic Acids (HAA5)	70.9325 µg/L 118% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Dalapon	64.165 µg/L 32% of the EPA limit 200 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Chloroform	57.557 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 61.9714 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Barium	56.2 µg/L 2.8% of the EPA limit 2000 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 59.8 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Dichloroacetic Acid	36.9292 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Trichloroacetic Acid	29.7183 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 31.7944 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Cyanide	5.2 µg/L 2.6% of the EPA limit 200 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 24.09 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Bromodichloromethane	21.8545 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 22.7292 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Lithium	12.4 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2024 Highest in the city: 13.3 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2024	2/2	UCMR-5
Lead	8.66 µg/L 58% of the EPA limit 15 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Dibromochloromethane	6.7436 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 7.13835 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Monochloroacetic Acid	5.4595 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 5.73695 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Monobromoacetic Acid	4.83695 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 4.8608 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Gross Beta Particle Activity	3.0625 pCi/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 3.139 pCi/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Dibromoacetic Acid	2.1825 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 2.25875 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
1,2-Dichloroethane	1.5 µg/L 30% of the EPA limit 5 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	1/2	SYR4
Combined Uranium	1.49 µg/L 5% of the EPA limit 30 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2017	2/2	SYR4
Combined Radium (-226 And -228)	1.13635 pCi/L 23% of the EPA limit 5 pCi/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	1/2	SYR4
Di(2-ethylhexyl) Phthalate	1.1 µg/L 18% of the EPA limit 6 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Xylenes, Total	1.08 µg/L 0% of the EPA limit 10000 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	1/2	SYR4
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Simazine	0.7800 µg/L 20% of the EPA limit 4 µg/L Highest in the city: W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	1/2	SYR4
Selenium	0.5300 µg/L 1.1% of the EPA limit 50 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019 Highest in the city: 0.7420 µg/L — W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	2/2	SYR4
Bromoform	0.7147 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Carbon Tetrachloride	0.5780 µg/L 12% of the EPA limit 5 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Atrazine	0.3855 µg/L 13% of the EPA limit 3 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Hexachlorocyclopentadiene	0.0449 µg/L 0.1% of the EPA limit 50 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	2/2	SYR4
Benzo(A)Pyrene	0.0240 µg/L 12% of the EPA limit 0.2000 µg/L Highest in the city: W JEFFERSON WW DISTRICT 2 · 140,264 people · 2019	1/2	SYR4
Hexachlorobenzene	0.0200 µg/L 2% of the EPA limit 1 µg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2019	1/2	SYR4
Pfba	0.0066 µg/L No EPA limit set Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 people · 2024	2/2	UCMR-5
Lead	0.0027 mg/L 18% of the EPA limit 0.0150 mg/L Main supplier: E JEFFERSON WW DISTRICT 1 · 275,163 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 Jefferson

Supplier	Population served
E JEFFERSON WW DISTRICT 1	275,163
W JEFFERSON WW DISTRICT 2	140,264

Frequently asked questions about Jefferson tap water

Is Jefferson tap water safe to drink?

EPA testing detected 35 contaminants in the water serving Jefferson. 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 Jefferson?

2 public water suppliers report drinking-water monitoring for Jefferson, Louisiana to the EPA. Each is listed above with its population served.

What contaminants are in Jefferson's water?

The contaminants EPA monitoring detected in Jefferson include Nitrate-Nitrite, Copper, Fluoride, TTHM, 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.