Is National City, CA Tap Water Safe to Drink?
National City tap water meets federal Safe Drinking Water Act standards but 1 of 1 ZIP code show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.
Where Does National City Get Its Water?
Water in National City, CA is provided by 2 public water systems: SAN DIEGO, CITY OF and SWEETWATER AUTHORITY.
How Is National City Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines and ozone. Treatment includes air stripping, conventional treatment (coagulation, flocculation, and filtration), direct filtration and groundwater disinfection.
What's in National City Tap Water?
The following contaminants were detected most frequently in National City public water systems. 1 of 1 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 33 µg/L | 10 µg/L | 1 ZIP | Above guideline |
| PFBA | 0.0089 µg/L | — | 1 ZIP | Within guideline |
| PFOA | 0.0079 µg/L | — | 1 ZIP | Within guideline |
| PFBS | 0.0075 µg/L | — | 1 ZIP | Within guideline |
| PFHxS | 0.0071 µg/L | — | 1 ZIP | Within guideline |
Health Risk Profile for National City
Based on EPA monitoring data, 1 of 1 ZIP codes in National 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.
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 National City Tap Water
Is National City tap water safe to drink?
National City tap water meets Safe Drinking Water Act requirements but 1 of 1 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 National City tap water?
The most commonly detected contaminants in National City water systems include: lithium, PFBA, PFOA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does National City get its drinking water?
National City receives water from 2 public water systems, including SAN DIEGO, CITY OF.
Do I need a water filter in National 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 National City tap water tested?
Public water systems in National 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 2025-07-17.
Tap water reports by ZIP in National City
- 91950 - National City tap water report Higher concern
Water utilities serving National 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.
- SWEETWATER AUTHORITYAction advised
Also covers / overlaps with
- San Diego CCD, CA · Township