OCEANSIDE 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 OCEANSIDE, CA
1 water provider on file serving this city.
Quick answer: OCEANSIDE'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 171,483 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Magnesium
Calcium
Sodium
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluorobutanoicacid (PFBA)
Turbidity
Combined Uranium
pH, Field
Manganese
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Combined Uranium
Detected: 4.5 PCI/L
10/13/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Manganese
Detected: 340 UG/L (ppb)
4/1/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 140 MG/L (ppm)
10/15/2025
Chloride
Detected: 120 MG/L (ppm)
10/15/2025
Nitrate
Detected: 0.73 MG/L (ppm)
10/29/2025
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: 25 MG/L (ppm)
10/27/2025
Calcium
Detected: 48 MG/L (ppm)
10/27/2025
Sodium
Detected: 69 MG/L (ppm)
1/13/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 220 MG/L (ppm)
10/27/2025
pH, Field
Detected: 8.11 PH
10/27/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 38 µg/L (ppb)
12/18/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Other
Additional substances tested that don't fit neatly into the categories above
TDS
Detected: 457 MG/L (ppm)
1/6/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.3 NG/L (ppt)
9/3/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2 NG/L (ppt)
7/9/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 1.9 NG/L (ppt)
8/6/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 2.4 NG/L (ppt)
8/6/2025
Turbidity
Detected: 0.1 NTU
10/6/2025
A measure of water cloudiness from suspended particles.
Filtration considerations: General system types, not a specific product recommendation.