Serving roughly 18,967 people in Monterey County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for GREENFIELD, CITY OF
1 water provider directly on file, serving roughly 18,967 people in Monterey County, California.
Quick answer: GREENFIELD, CITY OF has no violations on file and no single reading stands out against its peers (672 other providers in this area). It serves roughly 18,967 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
Nitrate
Bromoform
Dibromochloromethane
Aggressive Index
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
Calcium
Hardness, Total (ASCACO3)
Bromide
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Turbidity
Radium-228
pH
Boron, Total
Nickel
Chromium
Barium
Arsenic
Selenium
Conductivity (at 25°C)
Utility GREENFIELD, CITY OFPopulation served 18,967Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Nickel
Detected: 9.4 UG/L (ppb)
6/10/2025
Chromium
Detected: 1.4 UG/L (ppb)
6/10/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 32 UG/L (ppb)
6/10/2025
Arsenic
Detected: 1.6 UG/L (ppb)
6/10/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Selenium
Detected: 5.1 UG/L (ppb)
6/10/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Bromoform
Detected: 2 UG/L (ppb)
7/8/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
7/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1.2 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.
Chloride
Detected: 32 MG/L (ppm)
10/7/2025
Sulfate
Detected: 110 MG/L (ppm)
10/7/2025
Fluoride
Detected: 0.2 MG/L (ppm)
6/10/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 0.6 MG/L (ppm)
6/10/2025
Boron, Total
Detected: 120 UG/L (ppb)
10/7/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 19.7 MG/L (ppm)
10/7/2025
Potassium
Detected: 3.1 MG/L (ppm)
10/7/2025
Sodium
Detected: 37 MG/L (ppm)
10/7/2025
Calcium
Detected: 98 MG/L (ppm)
6/10/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.8 LANG
6/10/2025
Hardness, Total (ASCACO3)
Detected: 426 MG/L (ppm)
6/10/2025
pH
Detected: 8 PH
10/7/2025
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
Lithium
Detected: 21.6 µg/L (ppb)
10/1/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Bromide
Detected: 0.4 MG/L (ppm)
6/10/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 186 MG/L (ppm)
10/7/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.1 AGGR
6/10/2025
Langelier Index (Source Temp.)
Detected: -0.03 LANG
6/10/2025
Alkalinity, Total
Detected: 153 MG/L (ppm)
10/7/2025
TDS
Detected: 402 MG/L (ppm)
10/7/2025
Turbidity
Detected: 0.15 NTU
6/10/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.065 PCI/L
6/10/2025
Conductivity (at 25°C)
Detected: 1041 UMHO/CM
6/10/2025
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.