MONTEREY PARK is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
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Results for MONTEREY PARK, CA
1 water provider on file serving this city.
Quick answer: MONTEREY PARK's water currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
PFBA
PFPEA
Magnesium
Calcium
Alkalinity, Total
Hardness, Total (ASCACO3)
TDS
Sulfate
Fluoride
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluorononanoicacid (PFNA)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorodecanoicacid (PFDA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
pH
1, 4-Dioxane
Tetrachloroethylene
Trichloroethylene
Cis-1, 2-Dichloroethylene
Arsenic
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 1 provider
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Arsenic
Detected: 18 UG/L (ppb)
10/7/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 77 MG/L (ppm)
10/6/2025
Fluoride
Detected: 0.92 MG/L (ppm)
9/10/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 1.3 MG/L (ppm)
10/7/2025
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: 20 MG/L (ppm)
10/6/2025
Calcium
Detected: 66 MG/L (ppm)
10/6/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 250 MG/L (ppm)
10/6/2025
pH
Detected: 7.8 PH
10/6/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFBA
Detected: 0.0074 µg/L (ppb)
3/14/2025
PFPEA
Detected: 0.005 µg/L (ppb)
3/14/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Tetrachloroethylene
Detected: 7.4 UG/L (ppb)
10/7/2025
Trichloroethylene
Detected: 0.64 UG/L (ppb)
10/7/2025
Cis-1, 2-Dichloroethylene
Detected: 0.79 UG/L (ppb)
8/5/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 190 MG/L (ppm)
10/6/2025
TDS
Detected: 430 MG/L (ppm)
10/6/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 8.8 NG/L (ppt)
9/10/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 2.7 NG/L (ppt)
9/10/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 5.7 NG/L (ppt)
9/10/2025
Perfluorononanoicacid (PFNA)
Detected: 5.1 NG/L (ppt)
9/10/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 1.8 NG/L (ppt)
9/10/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 17 NG/L (ppt)
9/10/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorodecanoicacid (PFDA)
Detected: 6 NG/L (ppt)
9/10/2025
Perfluorohexanoicacid (PFHXA)
Detected: 3 NG/L (ppt)
9/10/2025
Perfluorobutanoicacid (PFBA)
Detected: 15 NG/L (ppt)
9/10/2025
Perfluoropentanoicacid (PFPEA)
Detected: 3.9 NG/L (ppt)
9/10/2025
1, 4-Dioxane
Detected: 0.09 UG/L (ppb)
10/7/2025
Filtration considerations: General system types, not a specific product recommendation.