Water Quality Report

The City of Morenci produces a Water Quality Report due to the state each spring. 

Most Recent Report:   6/17/2013


Each year, the City is required to sample the drinking water for various contaminants.  The table below lists all contaminates that were detected in 2012.  The state allows us to monitor for certain contaminants less than annually because the concentrations of these contaminants are not expected to change frequently.  The most recent results of these tests are also included in the table.


Terms and Abbreviations:

-          Maximum Contaminant Level (MCL).  The highest level of a contaminant that is allowed in drinking water.  MCL’s are set as close to the MCLG’s as possible using the best available treatment technology.

-          Maximum Contaminant Level Goal (MCLG).  The level of a contaminant in drinking water below which there is no known or expected health risk.

-          Maximum residual disinfectant level goal (MRDLG): 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 contaminants.

-          Maximum residual disinfectant level (MRDL): The highest level of a disinfectant allowed in drinking water.  There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants

-          Action Level (AL).  The concentration of a contaminant which, when exceeded, triggers treatment or other requirements which a water system may follow.

-          pCi/L picocuries per liter                                                                                            ppb – parts per billion or micrograms per liter

-          N/A – not applicable                                                                                                   ppm – parts per million or millirams per liter

-          ND – not detected                                                                                                      


CONTAMINANT          MCL         MCLG         MORENCI        RANGE OF          SAMPLE          VIOLATION         TYPICAL SOURCE                                                                                                       WATER        DETECTION           DATE                                           OF CONTAMINANT

Inorganic contaminants


Fluoride                         4 ppm             4 ppm               1.0 ppm               N/A                11/7/12                                 No           Erosion of natural


Unregulated Contaminants and special monitoring*                                                                     


Sodium                           N/A               N/A                 41 ppm                N/A          11/7/12                           N/A         Erosion of natural


Disinfection residual monitoring


Chlorine                       MRDL=           MRDLG=              0.8ppm             0.7-.0.8ppm                      Monthly         No           Water additive used to

                                   4 ppm             4 ppm                                                                                                                          control microbes


Lead & Copper


Copper                           AL=1300 ppb   1300 ppb            107 ppb        0 of 10 homes        9/25/12                    N/A        Corrosion of household

                                                                                                           exceeded the                                                            plumbing systems,

                                                                                                           action level                                                             erosion of natural deposits


Lead                               AL=15 ppb      0 ppb                 1.5 ppb            0 of 10 homes        9/15/12                        N/A

                                                                                                                      exceeded the

                                                                                                           action level


Disinfection Byproducts

                                                                                                                                                                                                                   By-products of drinking

TTHMs                                                                                   10 ppb                                             2010                           N/A            water disinfection


HAA5s                                                                             3 ppb                                          2010                          N/A          By-products of drinking

                                                                                                                                                                                                                   Water disinfection

*No established EPA drinking water standards. Sodium is considered special monitoring-there is no MCL associated with it.  Sodium monitoring is provided for those concerned with sodium in their diet.  5.21 ppm equates to about 1.23 milligrams of sodium per 8 ounce glass of water.  It is provided for individuals with particular health concerns.


Violation for 2012       

We did not complete our monitoring for nitrates before the due date in 2012. Coordination has been taken within our City Administration to

Assure that further sampling is completed on a timely basis.

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