Serving roughly 40,405 people in San Diego County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for SAN DIEGUITO WD
1 water provider directly on file, serving roughly 40,405 people in San Diego County, California.
Quick answer: SAN DIEGUITO WD has no violations on file. One reading is worth knowing about: Bromodichloromethane was measured at 17UG/L, among the highest of the 414 providers on file in this area. It's the most notable figure in this system's record among its 414 local peers.
Lead Summary
Lithium
PFHXA
PFBS
PFOA
PFPEA
Chlorite
TTHM
Totalhaloaceticacids (HAA5)
Lead
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Monobromoaceticacid
Dibromoaceticacid
Chlorate
Copper, Free
Utility SAN DIEGUITO WDPopulation served 40,405Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0011 mg/L (ppm)
12/31/2025
Lead
Detected: 4.4 UG/L (ppb)
7/16/2025
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.
Copper, Free
Detected: 640 UG/L (ppb)
7/16/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 55 UG/L (ppb)
8/12/2025
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.
Totalhaloaceticacids (HAA5)
Detected: 17 UG/L (ppb)
8/12/2025
Chloroform
Detected: 15 UG/L (ppb)
8/12/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 4.6 UG/L (ppb)
8/12/2025
Bromodichloromethane
Detected: 17 UG/L (ppb)
8/12/2025
Dibromochloromethane
Detected: 18 UG/L (ppb)
8/12/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 40 µg/L (ppb)
7/9/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXA
Detected: 0.0043 µg/L (ppb)
4/8/2024
PFBS
Detected: 0.0034 µg/L (ppb)
2/27/2024
PFOA
Detected: 0.0043 µg/L (ppb)
2/27/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFPEA
Detected: 0.0041 µg/L (ppb)
4/8/2024
Other
Additional substances tested that don't fit neatly into the categories above
Chlorite
Detected: 0.34 MG/L (ppm)
9/9/2025
Dichloroaceticacid
Detected: 7.4 UG/L (ppb)
8/12/2025
Trichloroaceticacid
Detected: 4.3 UG/L (ppb)
8/12/2025
Monobromoaceticacid
Detected: 1.2 UG/L (ppb)
2/19/2025
Dibromoaceticacid
Detected: 5 UG/L (ppb)
8/12/2025
Chlorate
Detected: 430 UG/L (ppb)
9/9/2025
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.