What was found in Meridian's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 7100 µg/L 71% of the EPA limit 10000 µg/L | 4/5 | SYR4 |
| Nitrate-Nitrite | 6900 µg/L 69% of the EPA limit 10000 µg/L | 4/5 | SYR4 |
| Fluoride | 1620 µg/L 41% of the EPA limit 4000 µg/L | 5/5 | SYR4 |
| Barium | 140 µg/L 7% of the EPA limit 2000 µg/L | 3/5 | SYR4 |
| Copper | 130 µg/L 10% of the EPA limit 1300 µg/L | 1/5 | SYR4 |
| Lithium | 99.5 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 60 µg/L 100% of the EPA limit 60 µg/L | 1/5 | SYR4 |
| Combined Uranium | 54 µg/L 180% of the EPA limit, in the worst sample — 30 µg/L | 4/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 15.4 pCi/L 103% of the EPA limit, in the worst sample — 15 pCi/L | 3/5 | SYR4 |
| TTHM | 13.9 µg/L 17% of the EPA limit 80 µg/L | 1/5 | SYR4 |
| Lead | 12 µg/L 80% of the EPA limit 15 µg/L | 1/5 | SYR4 |
| Chromium | 5 µg/L 5% of the EPA limit 100 µg/L | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 4.87 pCi/L 97% of the EPA limit 5 pCi/L | 3/5 | SYR4 |
| Arsenic | 4.4 µg/L 44% of the EPA limit 10 µg/L | 3/5 | SYR4 |
| Bromoform | 3.8 µg/L No EPA limit set | 1/5 | SYR4 |
| Dibromochloromethane | 3.5 µg/L No EPA limit set | 1/5 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.46 µg/L 58% of the EPA limit 6 µg/L | 1/5 | SYR4 |
| Xylenes, Total | 2.95 µg/L 0% of the EPA limit 10000 µg/L | 1/5 | SYR4 |
| Bromodichloromethane | 2 µg/L No EPA limit set | 1/5 | SYR4 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set | 1/5 | SYR4 |
| Chloroform | 1.6 µg/L No EPA limit set | 1/5 | SYR4 |
| Dichloroacetic Acid | 1.4 µg/L No EPA limit set | 1/5 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set | 1/5 | SYR4 |
| Toluene | 0.7000 µg/L 0.1% of the EPA limit 1000 µg/L | 1/5 | SYR4 |
| Ethylbenzene | 0.5300 µg/L 0.1% of the EPA limit 700 µg/L | 1/5 | SYR4 |
| Atrazine | 0.0980 µg/L 3.3% of the EPA limit 3 µg/L | 1/5 | SYR4 |
| PFOS | 0.0049 µg/L No EPA limit set | 1/5 | UCMR-5 |
| Lead | 0.0039 mg/L 26% of the EPA limit 0.0150 mg/L | 5/5 | LCR |
| PFHXS | 0.0038 µg/L No EPA limit set | 1/5 | UCMR-5 |
Water suppliers serving Meridian
| Supplier | Population served |
|---|---|
| MERIDIAN WATER DEPT | 147,340 |
| ARROWROCK RANCH | 250 |
| GREENHILLS ESTATES 3 | 200 |
| TERRACE WATER CORP INC | 84 |
| BITTERCREEK MEADOWS SUBDIVISION | 75 |
Frequently asked questions about Meridian tap water
Is Meridian tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Meridian. 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 Meridian?
5 public water suppliers report drinking-water monitoring for Meridian, Idaho to the EPA. Each is listed above with its population served.
What contaminants are in Meridian's water?
The contaminants EPA monitoring detected in Meridian include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. The full list, with the highest level found 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.