NORTHSTAR CSD - MARTIS VALLEY Water Quality Report
Serving roughly 4,493 people in Placer County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for NORTHSTAR CSD - MARTIS VALLEY
1 water provider directly on file, serving roughly 4,493 people in Placer County, California.
Quick answer: NORTHSTAR CSD - MARTIS VALLEY has no violations on file. One reading is worth knowing about: Aggressive Index was measured at 12AGGR, among the highest of the 246 providers on file in this area. It's the most notable figure in this system's record among its 246 local peers.
Lead Summary
Totalhaloaceticacids (HAA5)
Dichloroaceticacid
Aggressive Index
Magnesium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
pH
Chromium, Hex
Utility NORTHSTAR CSD - MARTIS VALLEYPopulation served 4,493Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.000846 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 1.4 UG/L (ppb)
3/6/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 1 UG/L (ppb)
8/12/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 9.81 MG/L (ppm)
1/30/2025
Calcium
Detected: 14.5 MG/L (ppm)
1/30/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 76.6 MG/L (ppm)
1/30/2025
pH
Detected: 8.17 PH
1/30/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 102 MG/L (ppm)
1/30/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1 UG/L (ppb)
8/12/2025
Aggressive Index
Detected: 12 AGGR
1/30/2025
Alkalinity, Total
Detected: 102 MG/L (ppm)
1/30/2025
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.