What was found in Monterey'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 |
|---|---|---|---|
| Barium | 2700 µg/L 135% of the EPA limit, at the 95th percentile of samples — 2000 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Copper | 700 µg/L 54% of the EPA limit 1300 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Fluoride | 157.5 µg/L 3.9% of the EPA limit 4000 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| TTHM | 50.65 µg/L 63% of the EPA limit 80 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Bromoform | 36.3 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 32.78 pCi/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 25.96 pCi/L 519% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 19.1 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Lithium | 17.4 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2025 | 1/1 | UCMR-5 |
| Gross Alpha, Excl. Radon And U | 13.12 pCi/L 87% of the EPA limit 15 pCi/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2016 | 1/1 | SYR4 |
| Dibromochloromethane | 13.065 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.1 µg/L 19% of the EPA limit 60 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Chromium | 10 µg/L 10% of the EPA limit 100 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Lead | 8 µg/L 53% of the EPA limit 15 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Dalapon | 7.61 µg/L 3.8% of the EPA limit 200 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Selenium | 7.2 µg/L 14% of the EPA limit 50 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.75 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 3.915 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 2.895 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2.85 µg/L 29% of the EPA limit 10 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.985 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Chloroform | 1.665 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1.434 µg/L No EPA limit set Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Hexachlorobenzene | 0.7380 µg/L 74% of the EPA limit 1 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.5590 µg/L 9.3% of the EPA limit 6 µg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0093 mg/L 62% of the EPA limit 0.0150 mg/L Main supplier: MONTEREY RURAL WATER SYSTEM INC · 5,250 people · 2025 | 1/1 | 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 Monterey
| Supplier | Population served |
|---|---|
| MONTEREY RURAL WATER SYSTEM INC | 5,250 |
Frequently asked questions about Monterey tap water
Is Monterey tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Monterey. 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 Monterey?
1 public water supplier report drinking-water monitoring for Monterey, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Monterey's water?
The contaminants EPA monitoring detected in Monterey include Barium, Copper, Fluoride, TTHM, Bromoform. 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.