We read 9 results from City of Daly City’s 2023 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 104,901 people · Water system ID CA4110013 · Read the district’s 2023 report (opens in a new tab)
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Results from the 2023 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Bromatehighest running annual average · range ND to 1.7 · Treated water · 2023 report, page 3 | 1 ppb | 0.1 ppb | 10 ppb | Above the health goal10x the health goal |
| Chloraminehighest running annual average · range 2.53 to 2.95 · Distribution system · 2023 report, page 3 | 2.78 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · range ND to 17 · Treated water · 2023 report, page 3 | 8.7 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of 55 homes tested, 0 over the action level · printed as 88 ppb · sampled 2022 · Customer taps · 2023 report, page 3 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 7.8 to 50.5 · Distribution system · 2023 report, page 3 | 50 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 13.3 to 65.8 · Distribution system · 2023 report, page 3 | 51.9 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.4 to 2.6 · Treated water · 2023 report, page 3 | 0.6 ppm | 1 ppm | 2 ppm | Below the health goal |
| Sulfateaverage · range 1.2 to 36 · Treated water · 2023 report, page 3 | 17 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · Treated water · 2023 report, page 3 | 84 ppm | — | 500 ppm guideline | Within the guideline |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Daly City’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium13 ppbFound in 2 of 20 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
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