Daly City
CA

Is Daly City, CA Tap Water Safe to Drink?

Daly City tap water meets federal Safe Drinking Water Act standards but 2 of 2 ZIP codes show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.

3Water systems
2ZIP codes
100%ZIPs above EPA guideline
Metro areaSan Francisco-Oakland-Fremont, CA
Latest data2025-03-03

Where Does Daly City Get Its Water?

Water in Daly City, CA is provided by 3 public water systems: CITY OF DALY CITY, CALIFORNIA WATER SERVICE-S SAN FRANCISCO and SAN FRANCISCO REGIONAL WATER SYSTEM.

How Is Daly City Tap Water Treated?

Treated water is disinfected using calcium hypochlorite and free chlorine and ozone. Treatment includes conventional treatment (coagulation, flocculation, and filtration), direct filtration, granular activated carbon filtration and groundwater disinfection.

What's in Daly City Tap Water?

The following contaminants were detected most frequently in Daly City public water systems. 2 of 2 ZIP codes showed detections above EPA health guidelines.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 23.6 µg/L 10 µg/L 2 ZIPs Above guideline
PFTrDA 0.007 µg/L — 0 ZIPs Within guideline
PFBA 0.005 µg/L — 0 ZIPs Within guideline
8:2 FTS 0.005 µg/L — 0 ZIPs Within guideline
6:2 FTS 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for Daly City

Based on EPA monitoring data, 2 of 2 ZIP codes in Daly City have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.

Best Broad-Spectrum Filters for This Water Profile

This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about Daly City Tap Water

Is Daly City tap water safe to drink?

Daly City tap water meets Safe Drinking Water Act requirements but 2 of 2 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.

What contaminants are in Daly City tap water?

The most commonly detected contaminants in Daly City water systems include: lithium, PFTrDA, PFBA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Daly City get its drinking water?

Daly City receives water from 3 public water systems, including CITY OF DALY CITY.

Do I need a water filter in Daly City?

If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.

How often is Daly City tap water tested?

Public water systems in Daly City are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-03-03.

Tap water reports by ZIP in Daly City

Water utilities serving Daly City, CA

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

Also covers / overlaps with