Is Marsing, ID Tap Water Safe? Quality & Contaminants

What was found in Marsing'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	10700 µg/L 107% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Nitrate	10375 µg/L 104% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Fluoride	2430 µg/L 61% of the EPA limit 4000 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	2/2	SYR4
Barium	160 µg/L 8% of the EPA limit 2000 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019 Highest in the city: 570 µg/L — HOPE HOUSE (OWYHEE) · 78 people · 2019	2/2	SYR4
Nitrite	120 µg/L 12% of the EPA limit 1000 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	2/2	SYR4
Selenium	18.3 µg/L 37% of the EPA limit 50 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Chromium	5 µg/L 5% of the EPA limit 100 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	2/2	SYR4
Combined Uranium	5 µg/L 17% of the EPA limit 30 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
TTHM	4.5 µg/L 5.6% of the EPA limit 80 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Arsenic	4.09 µg/L 41% of the EPA limit 10 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Total Haloacetic Acids (HAA5)	3.514 µg/L 5.9% of the EPA limit 60 µg/L Main supplier: MARSING CITY OF · 1,300 people · 2019	2/2	SYR4
Combined Radium (-226 And -228)	1.444 pCi/L 29% of the EPA limit 5 pCi/L Main supplier: MARSING CITY OF · 1,300 people · 2019	1/2	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MARSING CITY OF · 1,300 people · 2023	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 Marsing

Supplier	Population served
MARSING CITY OF	1,300
HOPE HOUSE (OWYHEE)	78

Frequently asked questions about Marsing tap water

Is Marsing tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Marsing. 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 Marsing?

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

What contaminants are in Marsing's water?

The contaminants EPA monitoring detected in Marsing include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Nitrite. 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.