Ajo Improvement Company

PWS ID# AZ0410-001

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As the owner and operator of this drinking water system, Ajo Improvement Company (AIC) is committed to providing a safe supply of drinking water to our customers. We issue this report by July 1sl of every year describing the quality of your drinking water to comply with state and U.S. Environmental Protection Agency (EPA) regulations. Much of the language used is mandated by regulations. This report provides valuable information about your drinking water, including information about its source and quality. We are pleased to report that AIC's water meets or exceeds all drinking water standards set by the state and federal government for 2015.

If you would like more information on the quality of your drinking water, have questions regarding this report, or require additional copies, please contact AIC, at (520) 387-2001. AIC recommends that customers serving more than one housing unit post a copy of this report in a conspicuous area.

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Information About Your Drinking Water

The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.

AIC's water source is groundwater that is obtained from the Childs Well Field located approximately six miles to the north of Ajo, Arizona.

In order to ensure that tap water is safe to drink, the Environmental Protection Agency (EPA) prescribes regulations that limit the amount of certain constituents in water provided by public water systems. The Food and Drug Administration (FDA) regulations establish limits for constituents in bottled water which must provide the same protection for public health.

Contaminants that may be present in source water include the following:

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency's Safe Drinking Water Hotline. at 1-800-426-4791. Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV-AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. U.S. Environmental Protection Agency (EPA) and the U.S. Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbiological contaminants are available from the Safe Drinking Water Hotline at 1-800-426-4791.

Source Water Assessment:

The Source Water Assessment (SWA) Program, developed and implemented by the Arizona Department of Environmental Quality (UADEQ") under EPA guidance, was created to promote community awareness of water quality issues and to encourage the protection of drinking water sources at the community level. ADEQ gathers information on drinking water sources including wells, surface water intakes, and springs and evaluates the extent to which the water source is vulnerable to natural or man-made contamination from sources such as gas stations, landfills, dry cleaners, agriculture fields, waste water treatment plants, and mining activities.

ADEQ has evaluated the source water areas in Pima County including the source waters for the AIC drinking water system. The SWA for the AIC drinking water system has been designated as low risk.

The complete SWA report is available for inspection at the ADEQ, 1110 W. Washington, Phoenix, Arizona 85007, between the hours of 8:00 am and 5:00 pm. Further source water assessment documentation can be obtained by contacting ADEQ, 602-771-4641 or visit ADEQ's Source Water Assessment Protection Unit website at: www.azdeg.gov/environ/water/dw/swap.html.

Information about Lead In Drinking Water

If present, elevated levels of lead 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. AIC 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 lake to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/safewaterllead.

Violations and Pubfic Notifications, if any:

Type / Description Compliance Period Potential Adverse Health Effects Corrective Actions taken by PWS

Water Quality Data:

The data in the attached tables are from water samples that have been analyzed by independent laboratories certified by the Arizona Department of Health Services.


Action Level (AL) The concentration of a contaminant that, if exceeded, triggers treatment or other requirements that a community water system shall follow.
Inorganic Substances of mineral origin, such as lead and copper.
Maximum Contaminant Level (MCL) The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible 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 risk to health. MCLGs allow for a margin of safety.
Microbiological Very small organisms, such as bacteria, algae, plankton and fungi.
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.
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.
MFL Million fibers per liter
ppb Parts per billion, or one microgram per liter (µg/l)
ppm Parts per million, or one milligram per liter (mg/l)
Treatment Technique A required process intended to reduce the level of a contaminant in drinking water

Table for Reporting Constituents

Constituents Units MCL MCLG Highest Level Detected or Running Annual Average-RAA Range Detected
Absent (A)
or Present (P)
Sample Month/Year Likely Source of Detected Constituent
Chlorine (ppm) MRDL = 4 MRDLG = 4 1.63 0.3 - 1.63 N 2015 Water additive used to control microbes
Haloacetic Acids (HAA5) (ppb) 60 N/A 7.6(1) A N 8/2015 Byproduct of drinking water disinfecton
Total Trihalomethanes (TTHM) (ppb) 80 N/A 39(2) A N 8/2015 Byproduct of drinking water disinfecton
Copper (ppm) AL = 1.3 MCLG = 1.3 90th Percentile = 0.0086 0 (A)
N 8/2014 Corrosion of household plumbing systems;erosion of natural deposits
Lead (ppb) AL = 15 0 90th Percentile = 0 0 (A)
N 8/2014 Corrosion of household plumbing systems;erosion of natural deposits
Nitrate (ppm) 10 10 3.6 N/A N 12/2015 Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits
Antimony (ppb) 6 6 <1 N/A N 12/2012 Discharge from petroleum refineries; fire retardants; ceramics, electronics and solder
Beryllium (ppb) 4 4 1 N/A N 12/2012 Discharge from metal refineries and coal-burning factories; Discharge from electrical, aerospace, and defense industries
Cyanide (ppb) 200 200 25 N/A N 12/2012 Discharge from steel/metal factories; Discharge from plastic and fertilizer factories
Nitrite (ppm) 1 1 <0.05 N/A N 12/2012 Runoff from fertilizer Nitrite use; Leaching from septic tanks, sewage; Erosion of natural deposits
Cadmium (ppb) 5 5 <5 N/A N 12/2012 Corrosion of galvanized pipes; Natural deposits; Metal refineries; Runoff from waste batteries and paints
Chromium (ppb) 100 100 1 N/A N 12/2012 Discharge from steel and pulp mills; Erosion of natural deposits
Mercury (ppb) 2 2 0.2 N/A N 12/2012 Erosion of natural deposits; Discharge from refineries and factories; Runoff from landfills and cropland
Thallium (ppb) 2 0.5 <1 N/A N 12/2012 Leaching from ore-processing sites; Discharge from electronics, glass, and drug factories
Selenium (ppb) 50 50 <5 N/A N 12/2012 Discharge from petroleum and metal refineries; Erosion of natural deposits; Discharge from mines
Barium (ppm) 2 2 0.038 N/A N 12/2012 Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits
Asbestos (MFL) 7 7 <0.01 N/A N 12/2012 Decay of asbestos cement water mains; Erosion of natural deposits
Arsenic (ppb) 10 0 RAA = 5(4) 0 (A)
N 2015 Erosion of natural deposits; Runoff from orchards; Runoff from glass and electronics production wastes
Fluoride (ppm) 4 4 0.94 N/A N 12/2012 Erosion of natural deposits; Water additive which promotes strong teeth; Discharge from fertilizer and aluminum factories
Sodium (ppm) N/A N/A 210 N/A N 12/2012 N/A

NOTE: Data presented in the tables above are from the most recent testing done in accordance with applicable regulations. Some constituents are monitored less frequently than once per year because either their concentrations do not change frequently, or they are not likely to be detected. Therefore, some of the water quality testing data contained herein, although representative, may be more than one year old. The EPA requires monitoring of over 80 drinking water contaminants. Those listed above are the only contaminants detected in your drinking water. For a complete list of all contaminants monitored please contact ADEQ.

(1) Haloacetic Acids (HAA5): AIC reports 0.0076; corrected to 7.6
(2) Total Trihalomethanes (TTHM): AIC reports 0.039; corrected to 39
(3) Lead: AIC reports 0.0017; corrected to 1.7
(4) Arsenic: AIC reports 0.005; corrected to 5
Note that these are clerical errors that did not account for conversion of mg/L to ppb.

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