Drinking water quality · 2023

What's in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA tap water

74 contaminants were measured in the South Tahoe Pud - Main — South Lake Tahoe, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit 1 sit at or above that limit.

Browse the mapFull source report ↗
Reporting year
2023
Contaminants measured
74
Over federal limit
1
Approaching the limit
0
Worst contaminant
PFOA
1.0× the limit
Service area
CA
state-level CCR
Source
Utility CCR

Compliance history

Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.

  • Maximum contaminant level exceededHealth-based
    5 violations on record · most recent Apr 2008
    resolved

Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗

PFAS ("forever chemicals")

ContaminantMeasuredStatus
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.4 ng/LMaximumSystem-wideAt or above the limit
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound.Not detected ng/LMinimumSystem-wideNone detected
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound.Not detected ng/LMinimumSystem-wideNone detected
9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound.Not detected ng/LMinimumSystem-wideNone detected
Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound.Not detected ng/LMaximumSystem-wideNone detected
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound.Not detected ng/LMinimumSystem-wideNone detected
Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.'Not detected ng/LMinimumSystem-wideNone detected
PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.Not detected ng/LMinimumSystem-wideNone detected
Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.'4 ng/LMaximumSystem-wideDetected — no federal limit
Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.'12.3 ng/LMaximumSystem-wideDetected — no federal limit
Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'14 ng/LMaximumSystem-wideDetected — no federal limit

Metals

ContaminantMeasuredStatus
CopperA metal that enters water from corroding household plumbing.613 ug/L90th percentileAt the tapWithin the limit
ArsenicA naturally occurring element that also enters water from industry and agriculture.4.1 ug/LAverageSystem-wideWithin the limit
BariumA metal from erosion of natural deposits and industrial discharge.12 ug/LAverageSystem-wideWithin the limit
AluminumA common element sometimes used as a treatment coagulant.Not detected ug/LAverageSystem-wideNone detected
AntimonyNot detected ug/LAverageSystem-wideNone detected
BerylliumNot detected ug/LAverageSystem-wideNone detected
CadmiumNot detected ug/LAverageSystem-wideNone detected
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.0.0 mg/L90th percentileAt the tapNone detected
MercuryA toxic metal from erosion of natural deposits and industrial runoff.Not detected ug/LAverageSystem-wideNone detected
NickelA metal from natural deposits and industrial discharge.Not detected ug/LAverageSystem-wideNone detected
SeleniumA trace element from natural deposits and industrial discharge.Not detected ug/LAverageSystem-wideNone detected
ThalliumNot detected ug/LAverageSystem-wideNone detected
CalciumA naturally occurring mineral that contributes to water hardness.14.9 mg/LAverageSystem-wideDetected — no federal limit
LithiumA naturally occurring element found in some groundwater.19.1 ug/LMaximumSystem-wideDetected — no federal limit

Other

ContaminantMeasuredStatus
Chlorine Free0.45 mg/LAverageSystem-wideWithin the limit
Chromium0.6 ug/LAverageSystem-wideWithin the limit
DiquatNot detected mg/LAverageSystem-wideNone detected
EndothallNot detected mg/LAverageSystem-wideNone detected
GlyphosateNot detected mg/LAverageSystem-wideNone detected
StyreneNot detected ug/LAverageSystem-wideNone detected

VOCs & pesticides

ContaminantMeasuredStatus
Dichloromethane0.5 ug/LAverageSystem-wideWithin the limit
1,2,3-TCPNot detected ug/LAverageSystem-wideNone detected
DBCP1,2-dibromo-3-chloropropane — a banned soil fumigant pesticide.Not detected mg/LAverageSystem-wideNone detected
MTBENot detected ug/LAverageSystem-wideNone detected
TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing.Not detected ug/LAverageSystem-wideNone detected
TolueneNot detected ug/LAverageSystem-wideWithin the limit
XylenesA group of industrial solvents found in gasoline and paint.Not detected ug/LAverageSystem-wideNone detected

Disinfection byproducts

ContaminantMeasuredStatus
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.1.9 ug/LAverageSystem-wideWithin the limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.Not detected ug/LAverageSystem-wideNone detected
PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection.Not detected ug/LAverageSystem-wideNone detected

Inorganic chemicals

ContaminantMeasuredStatus
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.0.19 mg/LAverageSystem-wideWithin the limit
FluorideA mineral often added to drinking water to help prevent tooth decay.75 ug/LAverageSystem-wideWithin the limit
AsbestosNot detected MFLAverageSystem-wideNone detected
CyanideNot detected ug/LAverageSystem-wideNone detected
NitriteA compound from fertilizer runoff, sewage, and erosion of natural deposits.Not detected mg/LAverageSystem-wideNone detected
BromideA naturally occurring salt found in source water.0.01 mg/LAverageSystem-wideDetected — no federal limit
ChlorideA naturally occurring salt compound.12.2 mg/LAverageSystem-wideDetected — no federal limit

Radionuclides

ContaminantMeasuredStatus
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.0.1 pCi/LAverageSystem-wideWithin the limit
Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements.Not detected pCi/LAverageSystem-wideNone detected
RadonA naturally occurring radioactive gas that can dissolve into groundwater.1455 pCi/LAverageSystem-wideDetected — no federal limit
UraniumA naturally occurring radioactive metal from erosion of natural deposits.4.5 pCi/LAverageSystem-wideDetected — no federal limit

Microbial

ContaminantMeasuredStatus
Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals.0 %AverageSystem-wideNone detected
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.0 %AverageSystem-wideDetected — no federal limit

Physical & aggregate

ContaminantMeasuredStatus
ColorA measure of visible tint in the water.Not detectedAverageSystem-wideNone detected
AlkalinityA measure of the water's capacity to neutralize acids.52.9 mg/LAverageSystem-wideDetected — no federal limit
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.140AverageSystem-wideDetected — no federal limit
TemperatureThe measured temperature of the water sample.49AverageSystem-wideDetected — no federal limit
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.107 mg/LAverageSystem-wideDetected — no federal limit
Source: South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.

People also ask about South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's water

+Is South Tahoe Pud - Main — South Lake Tahoe, Ca, CA tap water safe to drink in 2023?

The 2023 Consumer Confidence Report for the South Tahoe Pud - Main — South Lake Tahoe, Ca, CA water utility lists 1 contaminant at or above the federal limit: PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.

+What contaminants are in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA tap water?

74 contaminants were measured in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's 2023 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and inorganic chemicals. 16 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.

+Which contaminants exceed federal limits in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA tap water?

One contaminant in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's 2023 report sits at or above the federal limit: PFOA (1.0× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.

+What is the worst contaminant in South Tahoe Pud - Main — South Lake Tahoe, Ca, CA tap water?

The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOA, at 1.0× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.

+Where does the data on this page come from?

Every value is transcribed from South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.

+How often is South Tahoe Pud - Main — South Lake Tahoe, Ca, CA's water quality data updated?

Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.

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