Walnut Creek
CA

Is Walnut Creek, CA Tap Water Safe to Drink?

Walnut Creek, CA tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.

2Water systems
4ZIP codes
0%ZIPs above EPA guideline
Metro areaSan Francisco-Oakland-Fremont, CA
Latest data2024-07-09

Where Does Walnut Creek Get Its Water?

Water in Walnut Creek, CA is provided by 2 public water systems: CONTRA COSTA WATER DISTRICT and EAST BAY MUD.

How Is Walnut Creek 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), in-line filtration and post-ozone biofiltration.

What's in Walnut Creek Tap Water?

The following contaminants were detected most frequently in Walnut Creek public water systems. All detected levels fall at or below EPA health guidelines in this dataset.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 9 µg/L — 0 ZIPs Within guideline
PFTrDA 0.007 µg/L 0.007 µg/L 4 ZIPs Within guideline
6:2 FTS 0.005 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

Health Risk Profile for Walnut Creek

Current EPA monitoring data for Walnut Creek shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.

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 Walnut Creek Tap Water

Is Walnut Creek tap water safe to drink?

Walnut Creek tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.

What contaminants are in Walnut Creek tap water?

The most commonly detected contaminants in Walnut Creek water systems include: lithium, PFTrDA, 6:2 FTS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Walnut Creek get its drinking water?

Walnut Creek receives water from 2 public water systems, including CONTRA COSTA WATER DISTRICT.

Do I need a water filter in Walnut Creek?

Current data does not show guideline exceedances in Walnut Creek. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.

How often is Walnut Creek tap water tested?

Public water systems in Walnut Creek 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 2024-07-09.

Tap water reports by ZIP in Walnut Creek

Water utilities serving Walnut Creek, 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