Serving roughly 56,017 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for MONTE VISTA WD
1 water provider directly on file, serving roughly 56,017 people in San Bernardino County, California.
Quick answer: MONTE VISTA WD has no violations on file. One reading is worth knowing about: Nitrate-Nitrite was measured at 11MG/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
PFPEA
PFHXS
PFHXA
PFBA
PFOS
Totalhaloaceticacids (HAA5)
TTHM
Bromoform
Bromodichloromethane
Dibromochloromethane
Chloroform
Dibromoaceticacid
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Nitrate
Magnesium
Calcium
Hardness, Total (ASCACO3)
1, 2-Dibromo-3-Chloropropane
Perchlorate
Aggressive Index
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Potassium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Sulfate
Chloride
Fluoride
Nitrate-Nitrite
Utility MONTE VISTA WDPopulation served 56,017Owner 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
Copper, Free
Detected: 55 UG/L (ppb)
8/11/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 1.5 UG/L (ppb)
7/9/2025
TTHM
Detected: 1 UG/L (ppb)
10/8/2025
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: 1 UG/L (ppb)
10/8/2025
Bromodichloromethane
Detected: 1.5 UG/L (ppb)
10/8/2025
Dibromochloromethane
Detected: 2 UG/L (ppb)
10/8/2025
Chloroform
Detected: 1.4 UG/L (ppb)
10/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 2.9 MG/L (ppm)
10/28/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Sulfate
Detected: 33 MG/L (ppm)
7/21/2025
Chloride
Detected: 9.5 MG/L (ppm)
7/21/2025
Fluoride
Detected: 0.23 MG/L (ppm)
7/21/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 11 MG/L (ppm)
7/21/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 6.6 MG/L (ppm)
10/7/2025
Calcium
Detected: 69 MG/L (ppm)
10/7/2025
Potassium
Detected: 2.2 MG/L (ppm)
7/21/2025
Sodium
Detected: 20 MG/L (ppm)
7/21/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 200 MG/L (ppm)
10/7/2025
Langelier Index (pH(s))
Detected: 1.02 LANG
7/21/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFPEA
Detected: 0.0035 µg/L (ppb)
9/9/2025
PFHXS
Detected: 0.0054 µg/L (ppb)
9/9/2025
PFHXA
Detected: 0.0033 µg/L (ppb)
9/9/2025
PFBA
Detected: 0.0093 µg/L (ppb)
9/9/2025
PFOS
Detected: 0.0056 µg/L (ppb)
9/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 200 MG/L (ppm)
7/21/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 1.5 UG/L (ppb)
7/9/2025
Dichloroaceticacid
Detected: 3.7 UG/L (ppb)
7/9/2025
Trichloroaceticacid
Detected: 2.1 UG/L (ppb)
7/9/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.012 UG/L (ppb)
7/22/2025
Perchlorate
Detected: 1.5 UG/L (ppb)
10/28/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Aggressive Index
Detected: 12.23 AGGR
7/21/2025
Langelier Index (Source Temp.)
Detected: 0.41 LANG
7/21/2025
Alkalinity, Total
Detected: 160 MG/L (ppm)
7/21/2025
TDS
Detected: 320 MG/L (ppm)
7/21/2025
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.