RIO VISTA is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for RIO VISTA, CA
1 water provider on file serving this city.
Quick answer: RIO VISTA's water has no violations on file and no single reading stands out against its peers (1 other providers in this area). It serves roughly 10,489 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
TTHM
Bromoform
Bromodichloromethane
Dibromochloromethane
Trichloroaceticacid
Dibromoaceticacid
Arsenic
TDS
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Nitrate
Combined Uranium
Gross Alpha Particle Activity
pH, Field
Iron
Conductivity (at 25°C)
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2022
Arsenic
Detected: 7.1 UG/L (ppb)
10/1/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Combined Uranium
Detected: 1.34 PCI/L
6/26/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 150 UG/L (ppb)
3/27/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 5 UG/L (ppb)
8/7/2025
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.
Bromoform
Detected: 3 UG/L (ppb)
8/7/2025
Bromodichloromethane
Detected: 1 UG/L (ppb)
5/8/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
8/7/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.4 MG/L (ppm)
6/26/2025
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
Calcium
Detected: 12 MG/L (ppm)
3/27/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 6.85 PCI/L
6/26/2025
pH, Field
Detected: 7.97 PH
3/27/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 12 µg/L (ppb)
7/9/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 290 MG/L (ppm)
3/27/2025
Other
Additional substances tested that don't fit neatly into the categories above
Trichloroaceticacid
Detected: 1 UG/L (ppb)
5/8/2025
Dibromoaceticacid
Detected: 1 UG/L (ppb)
8/7/2025
TDS
Detected: 470 MG/L (ppm)
7/31/2025
Alkalinity, Total
Detected: 240 MG/L (ppm)
3/27/2025
Conductivity (at 25°C)
Detected: 759 UMHO/CM
7/31/2025
Filtration considerations: General system types, not a specific product recommendation.