whatsinmywater.co
EPA SDWIS · Napa County, California

Is CALISTOGA, CA Tap Water Safe?

CALISTOGA is served by 2 water providers on file with the EPA.

Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CALISTOGA, CA

2 water providers on file serving this city.

Quick answer: CALISTOGA's water has no violations on file and no single reading stands out against its peers (2 other providers in this area). It serves roughly 5,610 people, and the full breakdown below reflects everything EPA and California have on record for it.

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2022
Copper, Free
Detected: 120 UG/L (ppb)
4/30/2025
Iron
Detected: 480 UG/L (ppb)
4/8/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 100 UG/L (ppb)
4/8/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Aluminum
Detected: 440 UG/L (ppb)
4/8/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 31.2 UG/L (ppb)
7/15/2025
TTHM
Detected: 29.36 UG/L (ppb)
7/15/2025
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: 25.75 UG/L (ppb)
7/15/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 3.61 UG/L (ppb)
7/15/2025
Dibromochloromethane
Detected: 2.02 UG/L (ppb)
7/15/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 2.7 MG/L (ppm)
4/8/2025
Sulfate
Detected: 13 MG/L (ppm)
4/8/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 9.1 MG/L (ppm)
4/8/2025
Sodium
Detected: 4.2 MG/L (ppm)
4/8/2025
Calcium
Detected: 11 MG/L (ppm)
4/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 65 MG/L (ppm)
4/8/2025
pH
Detected: 7.57 PH
4/8/2025
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
PFHXA
Detected: 0.0032 µg/L (ppb)
6/4/2024
PFPEA
Detected: 0.0042 µg/L (ppb)
6/4/2024
PFOS
Detected: 0.0122 µg/L (ppb)
6/4/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0064 µg/L (ppb)
6/4/2024
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: 120 MG/L (ppm)
10/17/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 14.7 UG/L (ppb)
7/15/2025
Trichloroaceticacid
Detected: 16.5 UG/L (ppb)
7/15/2025
Monobromoaceticacid
Detected: 1.9 UG/L (ppb)
1/13/2025
Dibromoaceticacid
Detected: 1.1 UG/L (ppb)
4/8/2025
Carbon, Total
Detected: 1.95 MG/L (ppm)
10/17/2025
Odor
Detected: 14 TON
10/7/2025
Color
Detected: 10 UNITS
10/7/2025
Aggressive Index
Detected: 10.81 AGGR
4/8/2025
Alkalinity, Total
Detected: 120 MG/L (ppm)
10/17/2025
TDS
Detected: 130 MG/L (ppm)
4/8/2025
Turbidity
Detected: 24 NTU
4/8/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 160 UMHO/CM
4/8/2025
Filtration considerations: General system types, not a specific product recommendation.
Contaminant Whole-House Carbon Under-Sink RO Under-Sink Carbon
Total Trihalomethanes (TTHM)YesYesYes
Haloacetic Acids (HAA5)YesYesYes
ChloroformYesYesYes
Chlorine / TasteYesYesYes
Sediment / TurbidityYesYesYes
TrichloroethyleneYesYesYes
TetrachloroethyleneYesYesYes
cis-1,2-DichloroethyleneYesYesYes
1,1-DichloroethyleneYesYesYes
BromoformYesYesYes
BromodichloromethaneYesYesYes
DibromochloromethaneYesYesYes
1,1,2-TrichloroethaneYesYesYes
Vinyl ChlorideYesYesYes
Carbon TetrachlorideYesYesYes
BenzeneYesYesYes
TolueneYesYesYes
XyleneYesYesYes
Totalhaloaceticacids (HAA5)YesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
PFHXAPartialYes*Partial
PFPEAPartialYes*Partial
DichloroaceticacidPartialYesPartial
TrichloroaceticacidPartialYesPartial
MonobromoaceticacidPartialYesPartial
DibromoaceticacidPartialYesPartial
Copper, FreePartialYesPartial
Carbon, TotalPartialYesPartial
OdorPartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
ColorPartialYesPartial
Aggressive IndexPartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
AluminumPartialYesPartial
Conductivity (at 25°C)PartialYesPartial
Coliform Bacteria (indicator)NoYesNo
MagnesiumNoPartialNo
SodiumNoPartialNo
CalciumNoPartialNo
Alkalinity, BicarbonateNoNoNo
Hardness, Total (ASCACO3)NoNoNo
pHNoNoNo

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What is TTHM? Understanding EPA Violation Status Is Chromium-6 Dangerous? Whole-House vs. Under-Sink Filtration Lead and Copper in Drinking Water What is PFAS? Arsenic and Uranium Explained Nitrate and Fluoride Explained Water Hardness, pH, and Turbidity What is Coliform Bacteria?