Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
8
health-based violations
62
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Archived | 1998-10-01 → 1998-10-31 |
| MCL | Health-based | Archived | 1997-11-01 → 1997-11-30 |
| MCL | Health-based | Archived | 1997-04-01 → 1997-04-30 |
| MCL | Health-based | Archived | 1996-02-01 → 1996-02-29 |
| MCL | Health-based | Archived | 1995-07-01 → 1995-07-31 |
| MCL | Health-based | Archived | 1994-09-01 → 1994-09-30 |
| MCL | Health-based | Archived | 1993-08-01 → 1993-08-31 |
| MCL | Health-based | Archived | 1991-08-01 → 1991-08-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-01-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-01-31 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 4500 µg/L 45% of the EPA limit 10000 µg/L
worst single sample: 4900 µg/L | 162/350 | SYR4 | 2012–2019 |
| Copper | 84.6 µg/L 6.5% of the EPA limit 1300 µg/L
worst single sample: 130 µg/L | 119/218 | SYR4 | 2016–2019 |
| TTHM | 8.3 µg/L 10% of the EPA limit 80 µg/L
worst single sample: 13.9 µg/L | 109/155 | SYR4 | 2012–2019 |
| Combined Uranium | 37 µg/L 123% of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 54 µg/L | 94/105 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.22 µg/L No EPA limit set
worst single sample: 3.5 µg/L | 49/57 | SYR4 | 2018–2019 |
| Bromoform | 3.5 µg/L No EPA limit set
worst single sample: 3.8 µg/L | 46/57 | SYR4 | 2018–2019 |
| Lead | 0.0039 mg/L 26% of the EPA limit 0.0150 mg/L | 43/43 | LCR | 2026 |
| Bromodichloromethane | 1.5 µg/L No EPA limit set
worst single sample: 2 µg/L | 42/57 | SYR4 | 2018–2019 |
| Total Haloacetic Acids (HAA5) | 6.15 µg/L 10% of the EPA limit 60 µg/L
worst single sample: 60 µg/L | 38/151 | SYR4 | 2012–2019 |
| Lithium | 99.5 µg/L No EPA limit set | 36/48 | UCMR-5 | 2025 |
| Barium | 123.5 µg/L 6.2% of the EPA limit 2000 µg/L
worst single sample: 140 µg/L | 34/42 | SYR4 | 2012–2019 |
| Fluoride | 764 µg/L 19% of the EPA limit 4000 µg/L
worst single sample: 880 µg/L | 27/27 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.64 µg/L No EPA limit set
worst single sample: 2 µg/L | 25/53 | SYR4 | 2018–2019 |
| Chloroform | 1.4 µg/L No EPA limit set
worst single sample: 1.6 µg/L | 22/57 | SYR4 | 2018–2019 |
| Combined Radium (-226 And -228) | 4.63 pCi/L 93% of the EPA limit 5 pCi/L
worst single sample: 4.87 pCi/L | 21/67 | SYR4 | 2012–2019 |
| Arsenic | 4.27 µg/L 43% of the EPA limit 10 µg/L
worst single sample: 4.4 µg/L | 14/43 | SYR4 | 2012–2019 |
| Gross Alpha, Excl. Radon And U | 9.28 pCi/L 62% of the EPA limit 15 pCi/L
worst single sample: 15.4 pCi/L | 13/27 | SYR4 | 2012–2019 |
| Atrazine | 0.0980 µg/L 3.3% of the EPA limit 3 µg/L | 9/87 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 2840 µg/L 28% of the EPA limit 10000 µg/L
worst single sample: 3200 µg/L | 5/7 | SYR4 | 2018–2019 |
| Dichloroacetic Acid | 1.4 µg/L No EPA limit set | 4/53 | SYR4 | 2018–2019 |
| Xylenes, Total | 2.835 µg/L 0% of the EPA limit 10000 µg/L
worst single sample: 2.95 µg/L | 3/96 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) Phthalate | 3.342 µg/L 56% of the EPA limit 6 µg/L
worst single sample: 3.46 µg/L | 2/78 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set | 2/53 | SYR4 | 2018–2019 |
| Ethylbenzene | 0.5300 µg/L 0.1% of the EPA limit 700 µg/L | 1/96 | SYR4 | 2012–2019 |
| Lead | 12 µg/L 80% of the EPA limit 15 µg/L | 1/112 | SYR4 | 2016–2017 |
| Toluene | 0.7000 µg/L 0.1% of the EPA limit 1000 µg/L | 1/96 | SYR4 | 2012–2019 |
83 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Meridian Water Dept
Is Meridian Water Dept tap water safe to drink?
EPA monitoring detected 28 contaminants in Meridian Water Dept's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Meridian Water Dept's water?
EPA monitoring detected Nitrate, Copper, TTHM, Combined Uranium, Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Meridian Water Dept serve?
Meridian Water Dept reports serving 147,340 people in Idaho, per its EPA record.
Has Meridian Water Dept had any water quality violations?
The EPA has 62 violations on file for Meridian Water Dept, of which 8 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
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.