Serving roughly 99,650 people in Solano County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF VACAVILLE
1 water provider directly on file, serving roughly 99,650 people in Solano County, California.
Quick answer: CITY OF VACAVILLE has no violations on file. One reading is worth knowing about: Langelier Index (pH(s)) was measured at 0.84LANG, among the highest of the 186 providers on file in this area. It's the most notable figure in this system's record among its 186 local peers.
Lead Summary
Lithium
PFHXS
PFOS
PFBS
PFOA
Totalhaloaceticacids (HAA5)
TTHM
Magnesium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Carbon, Total
TDS
Chloride
Sulfate
Fluoride
Nitrate
Turbidity
pH
Odor
Chromium, Hex
Conductivity (at 25°C)
Color
Iron
Arsenic
Aluminum
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Potassium
Nitrogen-Ammoniaas (N)
Utility CITY OF VACAVILLEPopulation served 99,650Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 11 UG/L (ppb)
9/17/2025
Iron
Detected: 130 UG/L (ppb)
7/15/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 6.3 UG/L (ppb)
9/17/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Aluminum
Detected: 82 UG/L (ppb)
7/15/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 13 UG/L (ppb)
8/6/2025
TTHM
Detected: 59 UG/L (ppb)
8/6/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 45 UG/L (ppb)
8/6/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 11 UG/L (ppb)
8/6/2025
Dibromochloromethane
Detected: 2.9 UG/L (ppb)
8/6/2025
Bromoform
Detected: 0.5 UG/L (ppb)
5/13/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 14 MG/L (ppm)
7/15/2025
Sulfate
Detected: 25 MG/L (ppm)
7/15/2025
Fluoride
Detected: 0.72 MG/L (ppm)
10/2/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.43 MG/L (ppm)
7/31/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 20 MG/L (ppm)
10/8/2025
Sodium
Detected: 23 MG/L (ppm)
10/8/2025
Calcium
Detected: 16 MG/L (ppm)
10/8/2025
Potassium
Detected: 1.5 MG/L (ppm)
10/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH
Detected: 8.4 PH
7/15/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Langelier Index (pH(s))
Detected: 0.84 LANG
10/8/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 27.7 µg/L (ppb)
3/13/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.0035 µg/L (ppb)
5/13/2024
PFOS
Detected: 0.01 µg/L (ppb)
5/8/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBS
Detected: 0.0037 µg/L (ppb)
5/8/2024
PFOA
Detected: 0.0051 µg/L (ppb)
5/8/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 120 MG/L (ppm)
10/8/2025
Alkalinity, Carbonate
Detected: 5.9 MG/L (ppm)
7/15/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 120 MG/L (ppm)
10/8/2025
Carbon, Total
Detected: 3 MG/L (ppm)
10/2/2025
TDS
Detected: 220 MG/L (ppm)
7/15/2025
Turbidity
Detected: 0.34 NTU
7/15/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 2 TON
10/29/2025
Conductivity (at 25°C)
Detected: 400 UMHO/CM
7/15/2025
Color
Detected: 5 UNITS
7/15/2025
Dichloroaceticacid
Detected: 4.3 UG/L (ppb)
8/6/2025
Trichloroaceticacid
Detected: 8.5 UG/L (ppb)
8/6/2025
Dibromoaceticacid
Detected: 1.1 UG/L (ppb)
5/13/2025
Aggressive Index
Detected: 12 AGGR
10/8/2025
Temperature (CENTIGRADE)
Detected: 19 C
10/8/2025
Langelier Index (Source Temp.)
Detected: 0.24 LANG
10/8/2025
Nitrogen-Ammoniaas (N)
Detected: 0.062 MG/L (ppm)
1/7/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.