The Power of Information

National Drinking Water Database


South Tahoe Pud - Main Utilities - South Lake Tahoe, CA


Serves 60,000 people

Formaldehyde

Formaldehyde is a chemical found in plastics, resins used for rug and fabric coatings and adhesives for particle board; it is an air pollutant and probable human carcinogen and may form as a byproduct of tap water disinfection.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
10 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
16 days
Tests ConductedNumber of individual tests done for this contaminant
21 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
FormaldehydeFormaldehyde is a chemical found in plastics, resins used for rug and fabric coatings and adhesives for particle board; it is an air pollutant and probable human carcinogen and may form as a byproduct of tap water disinfection.12657.06 ppb
48000 ppb
Yes
1000 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Formaldehyde

Health Based Limits for Formaldehyde

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.5000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.7000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.10000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2005-11-0310000 ppb210 to 20000 ppb
2005-10-0433000 ppb1033000 ppb
2005-09-0748000 ppb1048000 ppb
2005-08-0225000 ppb2023000 to 27000 ppb
2005-07-0539000 ppb1039000 ppb
2005-06-0210000 ppb1010000 ppb
2005-05-044500 ppb210 to 9000 ppb
2005-03-038000 ppb108000 ppb
2004-08-090 ppb220 ppb
2004-07-200 ppb220 ppb
2004-06-0313 ppb1013 ppb
2004-05-038000 ppb108000 ppb
2004-04-1217000 ppb1017000 ppb
2004-03-080 ppb110 ppb
2004-02-090 ppb110 ppb
2004-01-140 ppb110 ppb