SAN DIEGO is served by 4 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for SAN DIEGO, CA
4 water providers on file serving this city.
Quick answer: SAN DIEGO's water has no violations on file and no single reading stands out against its peers (4 other providers in this area). It serves roughly 1,385,379 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Aggressive Index
Magnesium
Potassium
Sodium
Calcium
Bromide
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Alkalinity, Total
Hardness, Total (ASCACO3)
Silica
TDS
Sulfate
Chloride
Fluoride
Turbidity
pH
Boron, Total
Totalhaloaceticacids (HAA5)
TTHM
Chromium, Hex
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Perchlorate
Barium
Conductivity (at 25°C)
Nitrate
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 0.063 UG/L (ppb)
3/10/2025
Barium
Detected: 102 UG/L (ppb)
5/5/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 4.56 UG/L (ppb)
9/9/2025
TTHM
Detected: 42.5 UG/L (ppb)
9/9/2025
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: 14.2 UG/L (ppb)
9/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 2.12 UG/L (ppb)
9/9/2025
Bromodichloromethane
Detected: 14.2 UG/L (ppb)
9/9/2025
Dibromochloromethane
Detected: 12 UG/L (ppb)
9/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 145.5 MG/L (ppm)
9/2/2025
Chloride
Detected: 86.25 MG/L (ppm)
9/2/2025
Fluoride
Detected: 0.657 MG/L (ppm)
9/2/2025
Often added deliberately for dental health; can also occur naturally.
Boron, Total
Detected: 135 UG/L (ppb)
8/4/2025
Nitrate
Detected: 4.95 MG/L (ppm)
2/20/2025
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: 21.5 MG/L (ppm)
9/2/2025
Potassium
Detected: 4.39 MG/L (ppm)
9/2/2025
Sodium
Detected: 82.7 MG/L (ppm)
9/2/2025
Calcium
Detected: 53.8 MG/L (ppm)
9/2/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 245 MG/L (ppm)
6/2/2025
pH
Detected: 8.45 PH
9/2/2025
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: 33 µg/L (ppb)
10/18/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Bromide
Detected: 0.0614 MG/L (ppm)
9/2/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 137 MG/L (ppm)
9/2/2025
Alkalinity, Carbonate
Detected: 1.45 MG/L (ppm)
9/2/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.6 AGGR
9/2/2025
Alkalinity, Total
Detected: 115 MG/L (ppm)
9/2/2025
Silica
Detected: 9.42 MG/L (ppm)
9/2/2025
TDS
Detected: 515 MG/L (ppm)
9/2/2025
Turbidity
Detected: 0.05 NTU
8/4/2025
A measure of water cloudiness from suspended particles.
Dichloroaceticacid
Detected: 2.13 UG/L (ppb)
9/9/2025
Trichloroaceticacid
Detected: 1.25 UG/L (ppb)
9/9/2025
Dibromoaceticacid
Detected: 1.18 UG/L (ppb)
9/9/2025
Perchlorate
Detected: 0.58 UG/L (ppb)
3/10/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Conductivity (at 25°C)
Detected: 836 UMHO/CM
9/2/2025
Filtration considerations: General system types, not a specific product recommendation.