What was found in Ramona'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 | 14660 µg/L 147% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 223.5 µg/L 745% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Barium | 144 µg/L 7.2% of the EPA limit 2000 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Fluoride | 143.5 µg/L 3.6% of the EPA limit 4000 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Copper | 97.45 µg/L 7.5% of the EPA limit 1300 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2017 | 1/2 | SYR4 |
| TTHM | 43.5 µg/L 54% of the EPA limit 80 µg/L Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Lithium | 36 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2024 | 1/2 | UCMR-5 |
| Cyanide | 20 µg/L 10% of the EPA limit 200 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17.65 µg/L 29% of the EPA limit 60 µg/L Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 17 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 14 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 12 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Chloroform | 12 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Chromium | 12 µg/L 12% of the EPA limit 100 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Bromoform | 7.98 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Lead | 6 µg/L 40% of the EPA limit 15 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2015 | 1/2 | SYR4 |
| Dichloroacetic Acid | 5.71 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Selenium | 5 µg/L 10% of the EPA limit 50 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 4.82 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 3.8 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.58 µg/L No EPA limit set Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2019 | 1/2 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 0.7000 µg/L 14% of the EPA limit 5 µg/L Highest in the city: RANCHO SANTA TERESA MW CO. · 102 people · 2017 | 1/2 | SYR4 |
| Lead | 0.0017 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: RAMONA MUNICIPAL WD · 37,047 people · 2025
Highest in the city: 0.0037 mg/L — RANCHO SANTA TERESA MW CO. · 102 people · 2025 | 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 Ramona
| Supplier | Population served |
|---|---|
| RAMONA MUNICIPAL WD | 37,047 |
| RANCHO SANTA TERESA MW CO. | 102 |
Frequently asked questions about Ramona tap water
Is Ramona tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Ramona. 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 Ramona?
2 public water suppliers report drinking-water monitoring for Ramona, California to the EPA. Each is listed above with its population served.
What contaminants are in Ramona's water?
The contaminants EPA monitoring detected in Ramona include Nitrate, Combined Uranium, Barium, Fluoride, Copper. 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.