Serving roughly 3,429 people in San Diego County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for BORREGO WD
1 water provider directly on file, serving roughly 3,429 people in San Diego County, California.
Quick answer: BORREGO WD has no violations on file and no single reading stands out against its peers (414 other providers in this area). It serves roughly 3,429 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
Fluoride
Nitrate
Arsenic
TTHM
Bromoform
Dibromochloromethane
Utility BORREGO WDPopulation served 3,429Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Arsenic
Detected: 5.1 UG/L (ppb)
10/9/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 5.7 UG/L (ppb)
6/23/2025
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: 4.3 UG/L (ppb)
6/23/2025
Dibromochloromethane
Detected: 1.5 UG/L (ppb)
6/23/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 60 MG/L (ppm)
10/9/2025
Chloride
Detected: 65 MG/L (ppm)
10/9/2025
Fluoride
Detected: 0.32 MG/L (ppm)
10/9/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 1.3 MG/L (ppm)
10/9/2025
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: 3.1 MG/L (ppm)
10/9/2025
Potassium
Detected: 3.7 MG/L (ppm)
10/9/2025
Sodium
Detected: 82 MG/L (ppm)
10/9/2025
Calcium
Detected: 22 MG/L (ppm)
10/9/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 68 MG/L (ppm)
10/9/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 15.3 µg/L (ppb)
11/19/2024
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: 93 MG/L (ppm)
10/9/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 93 MG/L (ppm)
10/9/2025
TDS
Detected: 300 MG/L (ppm)
10/9/2025
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.