Serving roughly 4,947 people in Nevada County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF GRASS VALLEY
1 water provider directly on file, serving roughly 4,947 people in Nevada County, California.
Quick answer: CITY OF GRASS VALLEY has no violations on file. One reading is worth knowing about: Copper, Free was measured at 1220UG/L, among the highest of the 220 providers on file in this area. It's the most notable figure in this system's record among its 220 local peers.
Lead Summary
Lead
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dichloroaceticacid
Trichloroaceticacid
Copper, Free
Carbon, Total
Iron
Color
Alkalinity, Total
Alkalinity, Bicarbonate
Utility CITY OF GRASS VALLEYPopulation served 4,947Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.000884 mg/L (ppm)
12/31/2026
Lead
Detected: 0.613 UG/L (ppb)
9/24/2025
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: 1220 UG/L (ppb)
9/24/2025
Iron
Detected: 290 UG/L (ppb)
5/14/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 11.3 UG/L (ppb)
9/16/2025
TTHM
Detected: 11.6 UG/L (ppb)
9/16/2025
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.
Chloroform
Detected: 10.6 UG/L (ppb)
9/16/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 1 UG/L (ppb)
9/16/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 14.4 MG/L (ppm)
10/13/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 5.5 UG/L (ppb)
9/16/2025
Trichloroaceticacid
Detected: 5.8 UG/L (ppb)
9/16/2025
Carbon, Total
Detected: 0.65 MG/L (ppm)
9/8/2025
Color
Detected: 6 UNITS
9/15/2025
Alkalinity, Total
Detected: 14.4 MG/L (ppm)
10/13/2025
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.