DEFINITIONS AVG: Regulatory compliance with some MCLs are based on running annual average of monthly samples. MCL: (Maximum Contaminant Level) - The highest level of a contaminant in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology. MCLG: (Maximum Contaminant Level Goal) - The level of contaminant in drinking water below which there is no known or expected health risk. MCLG’s allow for a margin of safety. Level 1 Assessment : A Level 1 assessment is a study of the water system to identify potential problems and determine (if possible) why total coliform bacteria have been found in our water system. Level 2 Assessment : A Level 2 assessment is a very detailed study of the water system to identify potential problems and determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have been found in our water system on multiple occasions. MRDL: (Maximum Residual Disinfectant Level) - The highest level of disinfectant allowed in drinking water. There is convincing evidence that the addition of a disin- fectant is necessary for control of microbial contaminants. MRDLG: (Maximum Residual Disinfectant Level Goal) - The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contamination. MFL : Millions fiber per liter (a measure of asbestos) Mrem : Millirems per year (a measure of radiation absorbed by the body)
N/A : Not applicable ND : Not Detected NTU : Nephelometric Turbidity Units pCi/L : Picocuries per liter (a measure of radioactivity)
Ppb : Parts per billion, or micrograms per liter—or one ounce in 7,350,000 gallons of water Ppm : Parts per million, or milligrams per liter—or one ounce in 7,350 gallons of water Ppt : Parts per trillion, or nanograms per liter (ng/L) TT ( Treatment Technique): A required process intended to reduce the level of a contaminant in drinking water. Turbidity : A measure of the clarity of drinking water. The lower the turbidity, the better.
Unregulated Contaminants Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. Any unregulated contaminants detected are reported in the following table.
LEVEL
YEAR OF RANGE
Source of Contaminants
CONTAMINANT
Measure Unit
Averages
Minimum Maximum
MCL
MCLG
Chloroform Bromoform
2021 2021 2021 2021
5.80 0.38 4.58 3.23
2.22 0.00 3.29 2.39
11.20
N/A N/A N/A N/A
70
ppb ppb ppb ppb
Byproduct of drinking water disinfecƟon Byproduct of drinking water disinfecƟon Byproduct of drinking water disinfecƟon Byproduct of drinking water disinfecƟon
1.15 5.83 3.87
0 0
Bromodichloromethane Dibromochloromethane
60
LEAD AND COPPER
If present, elevated levels of lead and copper can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. DeSoto is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/safewater/lead.
Lead and Copper
Date Sampled
MCLG
AcƟon Level (AL)
90th PercenƟle**
* sites over AL
ViolaƟon
Unit of Measure
Likely Source of ContaminaƟon
Corrosion of household plumbing systems; erosion of natural deposits
Lead
2021
0
15
0
2
No
ppb
Erosion of natural deposits; leaching from wood preservaƟves; corrosion of household plumbing system.
Copper
2021
1.3
1.3
0.1666
0
No
ppm
*as annual average
**90 percenƟle value in the distribuƟon system
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