What was found in Idaho Falls'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 | 2520 µg/L 25% of the EPA limit 10000 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2018
Highest in the city: 4710 µg/L — BONNEVILLE ACRES WATER USERS ASSN INC · 100 people · 2019 | 23/23 | SYR4 |
| Nitrate-Nitrite | 2456 µg/L 25% of the EPA limit 10000 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019
Highest in the city: 3870 µg/L — RANCHO VIA WELL USERS ASSN INC · 40 people · 2019 | 22/23 | SYR4 |
| Fluoride | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2017
Highest in the city: 700 µg/L — WOODLAND HEIGHTS WATER ASSN #1 · 54 people · 2019 | 22/23 | SYR4 |
| Dibromochloromethane | 684.226 µg/L No EPA limit set Highest in the city: FALLS WATER COMPANY INC · 22,650 people · 2019 | 1/23 | SYR4 |
| Barium | 123 µg/L 6.2% of the EPA limit 2000 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2017
Highest in the city: 267.85 µg/L — COMORE LOMA · 1,500 people · 2019 | 22/23 | SYR4 |
| Nitrite | 30 µg/L 3% of the EPA limit 1000 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2018
Highest in the city: 140 µg/L — TAYLOR MOUNTAIN WATER AND SEWER DISTRICT · 600 people · 2019 | 4/23 | SYR4 |
| Lithium | 57.4 µg/L No EPA limit set Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2024 | 2/23 | UCMR-5 |
| Gross Alpha, Excl. Radon And U | 5.24 pCi/L 35% of the EPA limit 15 pCi/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019
Highest in the city: 16.79 pCi/L — FALCON RIDGE SUBDIVISION · 75 people · 2018 | 18/23 | SYR4 |
| TTHM | 6.8 µg/L 8.5% of the EPA limit 80 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019
Highest in the city: 7.109 µg/L — FALLS WATER COMPANY INC · 22,650 people · 2019 | 2/23 | SYR4 |
| Copper | 7 µg/L 0.5% of the EPA limit 1300 µg/L Highest in the city: BLACKHAWK ESTATES/IRON RIM · 270 people · 2018 | 2/23 | SYR4 |
| Combined Uranium | 2.1656 µg/L 7.2% of the EPA limit 30 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019
Highest in the city: 5.945 µg/L — COMORE LOMA · 1,500 people · 2019 | 22/23 | SYR4 |
| Toluene | 5.65 µg/L 0.6% of the EPA limit 1000 µg/L Highest in the city: COMORE LOMA · 1,500 people · 2019 | 2/23 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2017
Highest in the city: 3.65 µg/L — COMORE LOMA · 1,500 people · 2019 | 22/23 | SYR4 |
| Combined Radium (-226 And -228) | 1.565 pCi/L 31% of the EPA limit 5 pCi/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2018
Highest in the city: 3.05 pCi/L — RANCHO VIA WELL USERS ASSN INC · 40 people · 2016 | 18/23 | SYR4 |
| Chromium | 3 µg/L 3% of the EPA limit 100 µg/L Highest in the city: FALLS WATER COMPANY INC · 22,650 people · 2019 | 10/23 | SYR4 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L Highest in the city: WOODLAND HEIGHTS WATER ASSN #1 · 54 people · 2019 | 15/23 | SYR4 |
| Bromoform | 2.939 µg/L No EPA limit set Highest in the city: FALLS WATER COMPANY INC · 22,650 people · 2019 | 1/23 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.74 µg/L 29% of the EPA limit 6 µg/L Highest in the city: DJ PARK WELL · 35 people · 2019 | 3/23 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.7 µg/L 2.8% of the EPA limit 60 µg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019 | 2/23 | SYR4 |
| Xylenes, Total | 1.23 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: COMORE LOMA · 1,500 people · 2019 | 1/23 | SYR4 |
| Dibromoacetic Acid | 1.22 µg/L No EPA limit set Highest in the city: FALLS WATER COMPANY INC · 22,650 people · 2019 | 1/23 | SYR4 |
| Bromodichloromethane | 1.08 µg/L No EPA limit set Highest in the city: FALLS WATER COMPANY INC · 22,650 people · 2019 | 1/23 | SYR4 |
| Gross Beta Particle Activity | 0.5700 pCi/L No EPA limit set Highest in the city: J AND K WATER CORP · 370 people · 2013 | 1/23 | SYR4 |
| Chloroform | 0.5500 µg/L No EPA limit set Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2019 | 1/23 | SYR4 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: IDAHO FALLS CITY OF · 69,450 people · 2025
Highest in the city: 0.0130 mg/L — HIGHWAY ESTATES WATER ASSN · 65 people · 2024 | 23/23 | 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 Idaho Falls
| Supplier | Population served |
|---|---|
| IDAHO FALLS CITY OF | 69,450 |
| FALLS WATER COMPANY INC | 22,650 |
| COMORE LOMA | 1,500 |
| TAYLOR MOUNTAIN WATER AND SEWER DISTRICT | 600 |
| J AND K WATER CORP | 370 |
| BLACKHAWK ESTATES/IRON RIM | 270 |
| COUNTRY LIFE ESTATES | 250 |
| BONNEVILLE ACRES WATER USERS ASSN INC | 100 |
| MILLER COUNTRY ESTATES | 83 |
| FALCON RIDGE SUBDIVISION | 75 |
| HIGHWAY ESTATES WATER ASSN | 65 |
| LAZY EIGHT ESTATES | 60 |
| NUR WATER ASSN | 60 |
| WOODLAND HEIGHTS WATER ASSN #1 | 54 |
| TOWNSHIP PARK WATER COMPANY | 43 |
| COTTONWOOD ACRES DIV 4 | 43 |
| WESTWOOD WATER ASSN | 41 |
| RANCHO VIA WELL USERS ASSN INC | 40 |
| KAREY LANE WELL INC | 38 |
| DJ PARK WELL | 35 |
| BROOKHAVEN WATER ASSN | 33 |
| SOHNS MOBILE HOME PARK INC | 32 |
| NORTHSIDE ESTATES WELL | 30 |
Frequently asked questions about Idaho Falls tap water
Is Idaho Falls tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Idaho Falls. 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 Idaho Falls?
23 public water suppliers report drinking-water monitoring for Idaho Falls, Idaho to the EPA. Each is listed above with its population served.
What contaminants are in Idaho Falls's water?
The contaminants EPA monitoring detected in Idaho Falls include Nitrate, Nitrate-Nitrite, Fluoride, Dibromochloromethane, Barium. 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.