Is Vacaville, CA Tap Water Safe to Drink?
Vacaville tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOA: 5.1 ppt, PFOS: 9.9 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water.
Hardness Scale: Where Vacaville Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Vacaville Compares
Vacaville's water is close to the national average of 138 PPM, ranking #545 out of 1000 cities tracked. Within California, it ranks #75 of 87 cities (39% below the state average of 180 PPM). Among cities (50k-100k), Vacaville ranks #163 of 258 for hardness.
What Vacaville's Water Means for Your Home
Hardness: 110 PPM - Low Concern
Vacaville's water is firmly in the moderate range at 110 PPM. You'll see some spotting on glassware and a film on shower doors over time, but it's not the kind of hardness that demands a full softener. A salt-free conditioner is worth considering if you have a tankless water heater or high-end fixtures.
Contaminants & Safety
Forever chemicals (PFAS) are worth watching here. Vacaville has PFOA at 5.1 ppt and PFOS at 9.9 ppt, exceeding the EPA's 2024 limit of 4 ppt per compound. PFAS are synthetic compounds that accumulate in your body over time. A certified carbon filter or reverse osmosis system with NSF P473 certification is the most effective protection. See the regulatory timeline.
What's in the Treatment Process
Vacaville's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 33.1 ppb (41% of the legal limit, but 221x the EWG guideline) and HAA5 at 36.2 ppb (60% of the legal limit, but 362x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 7.23 ppb, which is 362x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 110 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 145 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 25.97 ppt | — | No total limit | Detected |
| ↳ PFOA | 5.1 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| ↳ PFOS | 9.9 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 1.8 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.4 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.739 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Vacaville Homes
Recommended Filter for Vacaville
PFAS exceed EPA limits (PFOA: 5.1 ppt, PFOS: 9.9 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
How to Test Your Water in Vacaville
With PFAS at 25.97 ppt in Vacaville's supply, confirming your home's specific levels is especially important. PFAS vary by neighborhood and can concentrate differently depending on your position in the distribution system.
Free option: Request City of Vacaville Utilities's annual Consumer Confidence Report for official city-level data.
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About Vacaville's Water Supply
Water Utility: City of Vacaville Utilities
Water Source: North Bay Aqueduct & local wells (Surface Water)
Population Served: 97,000
Hardness: 110 PPM (6.4 grains per gallon)
Vacaville's drinking water comes from surface sources — North Bay Aqueduct & local wells. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. On the upside, surface sources often deliver softer water than deep aquifers. The system serves 97,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request City of Vacaville Utilities's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by City of Vacaville Utilities in Vacaville, CA, including ZIP codes:
94533, 94534, 94535, 94571, 94585, 95620, 95625, 95653, 95687, 95688, 95694, 95696
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Vacaville to Other California Cities
Frequently Asked Questions About Vacaville Water
Is Vacaville tap water safe to drink?
Where does Vacaville's water come from?
Do I need a water softener in Vacaville?
How do I remove PFAS from Vacaville tap water?
What water filter is best for Vacaville?
Is Vacaville water safe for babies and infants?
What is the hardness of Vacaville water in grains per gallon?
What are disinfection byproducts in Vacaville's water?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Vacaville Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 110 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Vacaville's water data.