The Power of Information

National Drinking Water Database


South Norwalk Electric and Water Utilities - Stamford, CT


Serves 42,000 people

Lead (total)

Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
16 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
21 days
Tests ConductedNumber of individual tests done for this contaminant
65 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.1.82 ppb
7 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
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 Lead (total)

Health Based Limits for Lead (total)

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.2 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2007-08-090 ppb110 ppb
2007-08-081.6 ppb101.6 ppb
2007-07-192.8 ppb1870 to 30.7 ppb
2007-07-181.43 ppb730 to 4 ppb
2007-07-172.95 ppb201.1 to 4.8 ppb
2007-07-102 ppb102 ppb
2007-05-010 ppb110 ppb
2006-05-030 ppb110 ppb
2005-05-020 ppb110 ppb
2004-09-247 ppb107 ppb
2004-09-232.5 ppb202 to 3 ppb
2004-09-104 ppb104 ppb
2004-09-011 ppb101 ppb
2004-08-232 ppb102 ppb
2004-08-041 ppb101 ppb
2004-08-032 ppb102 ppb
2004-07-191.5 ppb201 to 2 ppb
2004-07-153.62 ppb1350 to 24 ppb
2004-07-140.86 ppb750 to 5 ppb
2004-07-132 ppb102 ppb
2004-05-030 ppb110 ppb