Is Daly City, CA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for City of Daly City.
3 public water systems serve parts of Daly City. The largest, City of Daly City, serves 102,593 people. Your water bill names your system.
Largest system
City of Daly City
102,593 people · Purchased surface water · EPA ID CA4110013
Buys treated water from San Francisco Regional Water System, California Water Service – South San Francisco, North Coast County Water District, Guadalupe Valley Mid Water System, Westborough Water District, City of Brisbane.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 0 ppb at the 90th percentile (Dec 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Across California, 129 of 691 water systems EPA tested had PFAS above a 2024 federal limit, and 26 systems were above the lead action level in results from the last five years. California results.
Daly City homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Daly City city (tables B25034, B25003). Estimates for small places have a margin of error.
Other water systems serving Daly City
- California Water Service – South San Francisco62,609 people · Purchased surface water · California · reported ZIPs hereLithium above screening level
- San Francisco Regional Water System600 people · Surface water · California · reported ZIPs hereNo PFAS above limits
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| San Bruno 5 mi California Water Service – South San Francisco | None above limits | 4.1 ppb |
| South San Francisco 5 mi California Water Service – South San Francisco | None above limits | 4.1 ppb |
| Pacifica 6 mi North Coast County Water District | None above limits | 0 ppb |
| Burlingame 9 mi City of Burlingame | None above limits | 6.3 ppb |
| Alameda 12 mi East Bay Municipal Utility District | None above limits | 0 ppb |
| San Mateo 12 mi California Water Service – San Mateo | None above limits | 4.4 ppb |
Daly City ZIP codes (2)
- 94014
- 94015
Questions
Is Daly City tap water safe to drink?
City of Daly City has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Daly City, CA?
3 public water systems serve parts of Daly City. The largest is City of Daly City (102,593 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Daly City tap water have PFAS?
None detected above EPA's reporting limits. City of Daly City had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Daly City homes have lead pipes?
Census estimates put 78% of Daly City homes as built before 1980 (California: 56%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. City of Daly City's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.