What was found in Lompoc'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-Nitrite | 200000 µg/L 2000% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 640000 µg/L — MISSION HILLS CSD · 3,600 people · 2015 | 3/6 | SYR4 |
| Nitrate | 605 µg/L 6.1% of the EPA limit 10000 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 7695 µg/L — MISSION HILLS CSD · 3,600 people · 2019 | 3/6 | SYR4 |
| Fluoride | 400 µg/L 10% of the EPA limit 4000 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 5/6 | SYR4 |
| Selenium | 10 µg/L 20% of the EPA limit 50 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 138 µg/L — VISTA HILLS MUTUAL WATER COMPANY · 75 people · 2019 | 3/6 | SYR4 |
| Barium | 82.61 µg/L 4.1% of the EPA limit 2000 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 104.3 µg/L — MISSION HILLS CSD · 3,600 people · 2018 | 2/6 | SYR4 |
| Lithium | 40.5 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2024
Highest in the city: 72.2 µg/L — VANDENBERG VILLAGE COMM. SERV. DIST. · 7,308 people · 2025 | 3/6 | UCMR-5 |
| Chromium | 13.3 µg/L 13% of the EPA limit 100 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 45.3 µg/L — MISSION HILLS CSD · 3,600 people · 2018 | 2/6 | SYR4 |
| TTHM | 36 µg/L 45% of the EPA limit 80 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 3/6 | SYR4 |
| Bromoform | 13.165 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 17.18 µg/L — VANDENBERG VILLAGE COMM. SERV. DIST. · 7,308 people · 2019 | 3/6 | SYR4 |
| Dibromochloromethane | 15.87 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 3/6 | SYR4 |
| Arsenic | 13.5 µg/L 135% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 5/6 | SYR4 |
| Copper | 10 µg/L 0.8% of the EPA limit 1300 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 2/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7 µg/L 12% of the EPA limit 60 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 9.18 µg/L — VANDENBERG VILLAGE COMM. SERV. DIST. · 7,308 people · 2019 | 3/6 | SYR4 |
| Bromodichloromethane | 7.48 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 2/6 | SYR4 |
| Combined Uranium | 7.30845 µg/L 24% of the EPA limit 30 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2018 | 2/6 | SYR4 |
| Dibromoacetic Acid | 6 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 6.06 µg/L — VANDENBERG VILLAGE COMM. SERV. DIST. · 7,308 people · 2019 | 3/6 | SYR4 |
| Chloroform | 3.1 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 2/6 | SYR4 |
| Dichloroacetic Acid | 2.8 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 2/6 | SYR4 |
| Monobromoacetic Acid | 2 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 2/6 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019
Highest in the city: 1.5 µg/L — VANDENBERG VILLAGE COMM. SERV. DIST. · 7,308 people · 2019 | 2/6 | SYR4 |
| Lead | 1.025 µg/L 6.8% of the EPA limit 15 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 1/6 | SYR4 |
| Cadmium | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 1/6 | SYR4 |
| Mercury | 0.2110 µg/L 11% of the EPA limit 2 µg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2019 | 1/6 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LOMPOC-CITY WATER UTILITY DIV · 40,473 people · 2025 | 6/6 | 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 Lompoc
| Supplier | Population served |
|---|---|
| LOMPOC-CITY WATER UTILITY DIV | 40,473 |
| VANDENBERG VILLAGE COMM. SERV. DIST. | 7,308 |
| MISSION HILLS CSD | 3,600 |
| VISTA HILLS MUTUAL WATER COMPANY | 75 |
| SANTA RITA WATER | 59 |
| CHALK HILL ESTATES HOA | 38 |
Frequently asked questions about Lompoc tap water
Is Lompoc tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Lompoc. 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 Lompoc?
6 public water suppliers report drinking-water monitoring for Lompoc, California to the EPA. Each is listed above with its population served.
What contaminants are in Lompoc's water?
The contaminants EPA monitoring detected in Lompoc include Nitrate-Nitrite, Nitrate, Fluoride, Selenium, 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.