Is Lancaster, CA Tap Water Safe to Drink?
Lancaster tap water meets federal Safe Drinking Water Act standards but 6 of 6 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.
Where Does Lancaster Get Its Water?
Water in Lancaster, CA is provided by 6 public water systems: CALIFORNIA WATER SERVICE CO.-LANCASTER, LOS ANGELES CWWD 40,REG 4 & 34-LANCASTER, QUARTZ HILL WATER DIST., AVERYDALE MWC, LOS ANGELES CWWD 40, REG. 38-LAKE LA and PALM RANCH IRRIGATION DIST..
How Is Lancaster Tap Water Treated?
Treated water is disinfected using chloramines and free chlorine and ozone. Treatment includes conventional treatment (coagulation, flocculation, and filtration), groundwater disinfection and ion exchange.
What's in Lancaster Tap Water?
The following contaminants were detected most frequently in Lancaster public water systems. 6 of 6 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 28.1 µg/L | 10 µg/L | 6 ZIPs | Above guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 6:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Lancaster
Based on EPA monitoring data, 6 of 6 ZIP codes in Lancaster 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 Lancaster Tap Water
Is Lancaster tap water safe to drink?
Lancaster tap water meets Safe Drinking Water Act requirements but 6 of 6 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 Lancaster tap water?
The most commonly detected contaminants in Lancaster water systems include: lithium, PFTrDA, 6:2 FTS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Lancaster get its drinking water?
Lancaster receives water from 6 public water systems, including CALIFORNIA WATER SERVICE CO.-LANCASTER.
Do I need a water filter in Lancaster?
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 Lancaster tap water tested?
Public water systems in Lancaster 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 2025-09-09.
Tap water reports by ZIP in Lancaster
- 93534 - North Antelope Valley CCD, Lancaster tap water report Higher concern
- 93535 - Palmdale, Lancaster tap water report Higher concern
- 93536 - Quartz Hill, Lancaster tap water report Higher concern
- 93539 - Lancaster tap water report Higher concern
- 93584 - Lancaster tap water report Higher concern
- 93586 - Lancaster tap water report Higher concern
Water utilities serving Lancaster, 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.
- LOS ANGELES CWWD 40,REG 4 & 34-LANCASTERAction advised
- ANTELOPE VALLEY EAST KERN WATER AGENCYNo recent federal sampling
Also covers / overlaps with
- North Antelope Valley CCD, CA · Township
- Lake Los Angeles, CA · CDP
- Palmdale, CA
- Quartz Hill, CA · CDP
- Tehachapi CCD, CA · Township