What was found in Lakeport'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 | 384.2 µg/L 3.8% of the EPA limit 10000 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 1200 µg/L — LAKE COUNTY CSA 13 - KONO TAYEE · 449 people · 2019 | 4/9 | SYR4 |
| Fluoride | 198 µg/L 5% of the EPA limit 4000 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 357 µg/L — PIER 1900 HOMEOWNER'S ASSOCIATION · 152 people · 2019 | 8/9 | SYR4 |
| Barium | 310 µg/L 16% of the EPA limit 2000 µg/L Highest in the city: Big Valley Rancheria Water District · 417 people · 2013 | 6/9 | SYR4 |
| Copper | 130 µg/L 10% of the EPA limit 1300 µg/L Highest in the city: KELSEYVILLE CO WATERWORKS DISTRICT 3 · 4,102 people · 2019 | 2/9 | SYR4 |
| TTHM | 35.98 µg/L 45% of the EPA limit 80 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 118.688 µg/L — LAKE COUNTY CSA 2 - SPRING VALLEY · 1,531 people · 2019 | 9/9 | SYR4 |
| Chloroform | 16.4265 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 70.167 µg/L — LAKE COUNTY CSA 21 - NORTH LAKEPORT · 4,046 people · 2019 | 8/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.17 µg/L 19% of the EPA limit 60 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 69.935 µg/L — LAKE COUNTY CSA 20 - SODA BAY · 2,003 people · 2019 | 9/9 | SYR4 |
| Bromodichloromethane | 6.2725 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 40.796 µg/L — LAKE COUNTY CSA 2 - SPRING VALLEY · 1,531 people · 2019 | 7/9 | SYR4 |
| Trichloroacetic Acid | 4.78 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 37.905 µg/L — LAKE COUNTY CSA 20 - SODA BAY · 2,003 people · 2019 | 7/9 | SYR4 |
| Dichloroacetic Acid | 6.79 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 31.845 µg/L — LAKE COUNTY CSA 20 - SODA BAY · 2,003 people · 2019 | 8/9 | SYR4 |
| Dibromochloromethane | 5.404 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 30.236 µg/L — LAKE COUNTY CSA 2 - SPRING VALLEY · 1,531 people · 2019 | 7/9 | SYR4 |
| Bromoform | 19.542 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019 | 5/9 | SYR4 |
| Lithium | 18 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2025 | 1/9 | UCMR-5 |
| Monochloroacetic Acid | 7.92 µg/L No EPA limit set Highest in the city: LAKE COUNTY CSA 20 - SODA BAY · 2,003 people · 2019 | 3/9 | SYR4 |
| Bromate | 7.675 µg/L 77% of the EPA limit 10 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019 | 3/9 | SYR4 |
| Dibromoacetic Acid | 2.355 µg/L No EPA limit set Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 6.66 µg/L — LAKE COUNTY CSA 2 - SPRING VALLEY · 1,531 people · 2019 | 7/9 | SYR4 |
| Arsenic | 2.4 µg/L 24% of the EPA limit 10 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2019
Highest in the city: 4.91 µg/L — LAKE COUNTY CSA 21 - NORTH LAKEPORT · 4,046 people · 2019 | 7/9 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Highest in the city: LAKE COUNTY CSA 2 - SPRING VALLEY · 1,531 people · 2019 | 1/9 | SYR4 |
| Xylenes, Total | 0.5600 µg/L 0% of the EPA limit 10000 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2017 | 1/9 | SYR4 |
| Toluene | 0.5500 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2017 | 1/9 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LAKEPORT, CITY OF · 4,762 people · 2024
Highest in the city: 0.0240 mg/L — Big Valley Rancheria Water District · 417 people · 2025 | 9/9 | LCR |
| Bhc-Gamma | 0.0100 µg/L 5% of the EPA limit 0.2000 µg/L Highest in the city: Big Valley Rancheria Water District · 417 people · 2013 | 1/9 | SYR4 |
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 Lakeport
| Supplier | Population served |
|---|---|
| LAKEPORT, CITY OF | 4,762 |
| KELSEYVILLE CO WATERWORKS DISTRICT 3 | 4,102 |
| LAKE COUNTY CSA 21 - NORTH LAKEPORT | 4,046 |
| LAKE COUNTY CSA 20 - SODA BAY | 2,003 |
| LAKE COUNTY CSA 2 - SPRING VALLEY | 1,531 |
| LAKE COUNTY CSA 13 - KONO TAYEE | 449 |
| Big Valley Rancheria Water District | 417 |
| PIER 1900 HOMEOWNER'S ASSOCIATION | 152 |
| CORINTHIAN BAY MUTUAL WATER COMPANY | 150 |
Frequently asked questions about Lakeport tap water
Is Lakeport tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Lakeport. 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 Lakeport?
9 public water suppliers report drinking-water monitoring for Lakeport, California to the EPA. Each is listed above with its population served.
What contaminants are in Lakeport's water?
The contaminants EPA monitoring detected in Lakeport include Nitrate, Fluoride, Barium, Copper, TTHM. 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.