SAN JOAQUIN is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for SAN JOAQUIN, CA
1 water provider on file serving this city.
Quick answer: SAN JOAQUIN'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 4,060 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Manganese, Dissolved
Iron, Dissolved
Lead
Iron
Manganese
Copper, Free
Aggressive Index
Langelier Index (pH(s))
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Fluoride
Turbidity
Gross Alpha Particle Activity
pH
Arsenic
Conductivity (at 25°C)
Color
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Manganese, Dissolved
Detected: 44 UG/L (ppb)
7/8/2025
Iron, Dissolved
Detected: 84 UG/L (ppb)
7/8/2025
Lead
Detected: 7.2 UG/L (ppb)
8/19/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Iron
Detected: 30 UG/L (ppb)
10/6/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 55 UG/L (ppb)
10/6/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Copper, Free
Detected: 60 UG/L (ppb)
8/19/2025
Arsenic
Detected: 2.5 UG/L (ppb)
8/11/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 95 MG/L (ppm)
8/11/2025
Sulfate
Detected: 230 MG/L (ppm)
8/11/2025
Fluoride
Detected: 0.29 MG/L (ppm)
8/11/2025
Often added deliberately for dental health; can also occur naturally.
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.043 LANG
8/11/2025
Gross Alpha Particle Activity
Detected: 7.37 PCI/L
1/16/2025
pH
Detected: 8 PH
8/11/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 18.8 µg/L (ppb)
9/12/2023
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: 140 MG/L (ppm)
8/11/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.1 AGGR
8/11/2025
Alkalinity, Total
Detected: 140 MG/L (ppm)
8/11/2025
TDS
Detected: 680 MG/L (ppm)
8/11/2025
Turbidity
Detected: 16 NTU
8/11/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 1100 UMHO/CM
8/11/2025
Color
Detected: 30 UNITS
8/11/2025
Filtration considerations: General system types, not a specific product recommendation.