What was found in Daly City'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 | 16000 µg/L 160% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Fluoride | 167.99999999999983 µg/L 4.2% of the EPA limit 4000 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| TTHM | 59.762499999999996 µg/L 75% of the EPA limit 80 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Chloroform | 57.96249999999999 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 54.725 µg/L 91% of the EPA limit 60 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 32.08 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 24.734999999999985 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Chromium | 18 µg/L 18% of the EPA limit 100 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Lithium | 13 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2023 | 1/1 | UCMR-5 |
| Bromodichloromethane | 4.4075 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 4 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 2.9999999999999996 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2.95 µg/L 30% of the EPA limit 10 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Bromoform | 2.83 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Diquat | 2.2 µg/L 11% of the EPA limit 20 µg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.1099999999999994 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 1.27 pCi/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: CITY OF DALY CITY · 104,901 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF DALY CITY · 104,901 people · 2025 | 1/1 | LCR |
Water suppliers serving Daly City
| Supplier | Population served |
|---|---|
| CITY OF DALY CITY | 104,901 |
Frequently asked questions about Daly City tap water
Is Daly City tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Daly City. 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 Daly City?
1 public water supplier report drinking-water monitoring for Daly City, California to the EPA. Each is listed above with its population served.
What contaminants are in Daly City's water?
The contaminants EPA monitoring detected in Daly City include Nitrate, Fluoride, TTHM, Chloroform, Total Haloacetic Acids (HAA5). 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.