EXETER is served by 2 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 EXETER, CA
2 water providers on file serving this city.
Quick answer: EXETER's water has no violations on file and no single reading stands out against its peers (2 other providers in this area). It serves roughly 11,169 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Magnesium
Sodium
Calcium
Alkalinity, Total
TDS
Chloride
Sulfate
Fluoride
Nitrate
Adsorbableorganicfluorine
Turbidity
Radium-228
pH
Odor
1, 2-Dibromo-3-Chloropropane
Perchlorate
Nickel
Chromium
Barium
Arsenic
Aluminum
Conductivity (at 25°C)
Color
Lead
Copper, Free
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0017 mg/L (ppm)
Found at 2 providers
Nickel
Detected: 1.7 UG/L (ppb)
6/17/2025
Chromium
Detected: 2.6 UG/L (ppb)
6/17/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 130 UG/L (ppb)
6/17/2025
Arsenic
Detected: 1.2 UG/L (ppb)
6/17/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Aluminum
Detected: 4.8 UG/L (ppb)
6/17/2025
Lead
Detected: 0.5 UG/L (ppb)
6/18/2025
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: 37.3 UG/L (ppb)
6/18/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 17 MG/L (ppm)
6/17/2025
Sulfate
Detected: 39 MG/L (ppm)
6/17/2025
Fluoride
Detected: 0.14 MG/L (ppm)
6/17/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 6.4 MG/L (ppm)
Found at 2 providers
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: 19 MG/L (ppm)
6/17/2025
Sodium
Detected: 39 MG/L (ppm)
6/17/2025
Calcium
Detected: 54 MG/L (ppm)
6/17/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
pH
Detected: 7.6 PH
6/17/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 230 MG/L (ppm)
6/17/2025
TDS
Detected: 420 MG/L (ppm)
6/17/2025
Adsorbableorganicfluorine
Detected: 1700 NG/L (ppt)
1/8/2025
Turbidity
Detected: 0.1 NTU
6/17/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.328 PCI/L
4/17/2025
Odor
Detected: 1 TON
6/17/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.039 UG/L (ppb)
6/17/2025
Perchlorate
Detected: 1.2 UG/L (ppb)
6/17/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Conductivity (at 25°C)
Detected: 600 UMHO/CM
6/17/2025
Color
Detected: 5 UNITS
6/17/2025
Filtration considerations: General system types, not a specific product recommendation.