Is O'Neill, NE Tap Water Safe? Quality & Contaminants

What was found in O'Neill'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	885 µg/L 8.9% of the EPA limit 10000 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019 Highest in the city: 29900 µg/L — EAST PARK ESTATES · 100 people · 2019	2/2	SYR4
Fluoride	1159 µg/L 29% of the EPA limit 4000 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	2/2	SYR4
Barium	98.17 µg/L 4.9% of the EPA limit 2000 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019 Highest in the city: 186.4 µg/L — EAST PARK ESTATES · 100 people · 2018	2/2	SYR4
Copper	98.555 µg/L 7.6% of the EPA limit 1300 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	2/2	SYR4
Lithium	11.4 µg/L No EPA limit set Main supplier: ONEILL, CITY OF · 3,705 people · 2023	1/2	UCMR-5
Lead	8.5855 µg/L 57% of the EPA limit 15 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	2/2	SYR4
Arsenic	7.39 µg/L 74% of the EPA limit 10 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	2/2	SYR4
Chromium	6.433 µg/L 6.4% of the EPA limit 100 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	2/2	SYR4
Cyanide	5.095 µg/L 2.5% of the EPA limit 200 µg/L Highest in the city: EAST PARK ESTATES · 100 people · 2017	1/2	SYR4
TTHM	3.66 µg/L 4.6% of the EPA limit 80 µg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2019	1/2	SYR4
Chloroform	1.55 µg/L No EPA limit set Main supplier: ONEILL, CITY OF · 3,705 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	1.241 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: ONEILL, CITY OF · 3,705 people · 2018	1/2	SYR4
Dibromochloromethane	1.08 µg/L No EPA limit set Main supplier: ONEILL, CITY OF · 3,705 people · 2019	1/2	SYR4
Bromodichloromethane	1.03 µg/L No EPA limit set Main supplier: ONEILL, CITY OF · 3,705 people · 2019	1/2	SYR4
Lead	0.0011 mg/L 7.4% of the EPA limit 0.0150 mg/L Main supplier: ONEILL, CITY OF · 3,705 people · 2025 Highest in the city: 0.0011 mg/L — EAST PARK ESTATES · 100 people · 2027	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 O'Neill

Supplier	Population served
ONEILL, CITY OF	3,705
EAST PARK ESTATES	100

Frequently asked questions about O'Neill tap water

Is O'Neill tap water safe to drink?

EPA testing detected 15 contaminants in the water serving O'Neill. 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 O'Neill?

2 public water suppliers report drinking-water monitoring for O'Neill, Nebraska to the EPA. Each is listed above with its population served.

What contaminants are in O'Neill's water?

The contaminants EPA monitoring detected in O'Neill include Nitrate-Nitrite, Fluoride, Barium, Copper, Lithium. 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.