Is Hidden Valley Lake, CA Tap Water Safe to Drink?
Hidden Valley Lake tap water meets federal Safe Drinking Water Act standards but 1 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.
Where Does Hidden Valley Lake Get Its Water?
Water in Hidden Valley Lake, CA is provided by 1 public water system: HIDDEN VALLEY LAKE CSD.
How Is Hidden Valley Lake Tap Water Treated?
Treated water is disinfected using chloramines. Treatment includes groundwater disinfection.
What's in Hidden Valley Lake Tap Water?
The following contaminants were detected most frequently in Hidden Valley Lake public water systems. 1 of 2 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 17.3 µg/L | 10 µg/L | 1 ZIP | Above guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Hidden Valley Lake
Based on EPA monitoring data, 1 of 2 ZIP codes in Hidden Valley Lake 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 Filters for PFAS Water Profile
PFAS compounds are detected in this water supply. A reverse osmosis (RO) system or an activated-carbon filter specifically certified under NSF/ANSI P473 is required for reliable PFAS reduction. Standard pitcher and faucet filters without P473 certification do not remove PFAS.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Hidden Valley Lake Tap Water
Is Hidden Valley Lake tap water safe to drink?
Hidden Valley Lake tap water meets Safe Drinking Water Act requirements but 1 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 Hidden Valley Lake tap water?
The most commonly detected contaminants in Hidden Valley Lake water systems include: lithium, PFTrDA, HFPO-DA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Hidden Valley Lake get its drinking water?
Hidden Valley Lake receives water from one public water system, including HIDDEN VALLEY LAKE CSD.
Do I need a water filter in Hidden Valley Lake?
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 Hidden Valley Lake tap water tested?
Public water systems in Hidden Valley Lake 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 2025-08-06.
Tap water reports by ZIP in Hidden Valley Lake
- 95461 - Middletown, Hidden Valley Lake tap water report No recent data
- 95467 - Lower Lake CCD, Hidden Valley Lake tap water report Higher concern
Water utilities serving Hidden Valley Lake, 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.
- HIDDEN VALLEY LAKE CSDAction advised
- Ignome Irrigation Well (WQP)No recent federal sampling
Also covers / overlaps with
- Middletown CCD, CA · Township
- Cobb CCD, CA · Township
- Lower Lake CCD, CA · Township
- Middletown, CA · CDP