Ajo Improvement Company, ("AIC") is pleased to present its 2007 water quality report (Consumer Confidence Report) for its Ajo water system. Additional copies of the report are available at the AIC office located on Elota Avenue in Ajo, Arizona; via mail by sending a request to AIC, PO Drawer 9, Ajo, Arizona 85321; or by calling 520-387-7151. Ajo Improvement Company recommends that customers serving more than one housing unit post a copy of this report in a conspicuous place. If you have questions regarding this report or if you require this report in Spanish, please contact AIC at (520) 387-7151. Si tiene usted alguna pregunta sobre este informe de Calidad de el Agua, o require este informe en espanol, favor de escribir a Ajo Improvement Company, P O Drawer 9, Ajo, AZ 853210 lIame por telefono a (520) 387-7151.


PWSID# 10-001

This report contains important information about your drinking water. Este informe contiene informacion muy importante sobre su agua para beber. Traduzcalo o hable con alguien que lo entienda bien.

Ajo Improvement Company's water source is groundwater which is obtained from an underground well field located approximately six miles north of Ajo, Arizona. The groundwater is delivered from the well field to holding tanks. The water is then routed through a Water Treatment Plant for the removal of naturally occurring arsenic and fluoride and chlorinated before it is delivered to the community through the water distribution system.

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


Water Quality Constituent Units MCL MCLG Highest Level Detected Range of Levels Detected Sample Year Likely Source of Detected Constituent
1. Arsenic ppm .010 0 .004 .004 2006 Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes
2. Chromium ppm .1 .1 .018 .018 2006 Discharge from steel and pulp mills; erosion of natural deposits
3. Fluoride ppm 4 4 2.6 2.6 2006 Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories
4. Nitrate ppm 10 10 3.6 3.6 2007 Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits


Water Quality Constituent Units MCL MCLG Highest Level Detected Range of Levels Detected Sample Year Likely Source of Detected Constituent
5. Gross Alpha pCi/L 15 0 1.9 1.9 2003 Erosion of natural deposits.


Water Quality Constituent Units MRDLG MRDL Highest Level Detected Range of Levels Detected Sample Year Likely Source of Detected Constituent
6. Chlorine ppm 0 4 .38 0.01-0.38 2007 Water additive used to control microbes
Water Quality Constituent Units MCL MCLG Highest Level Detected Range of Levels Detected Sample Year Likely Source of Detected Constituent
7. Total Trihalomethanes (TTHM) ppm .08 None .0042 .0042 2007 By-product of drinking water chlorination


Water Quality Constituent Units Action Level 90th Percentile of Sample Results Number of Samples That Exceeded the Action Level Sample Year Likely Source of Detected Constituent
8. Lead ppm 0.015 0.0014 0 2007 Corrosion of household plumbing systems; erosion of natural deposits
9. Copper ppm 1.3 0.053 0 2007 Corrosion of household plumbing systems; erosion of natural deposits; Leaching from wood preservatives


Water Quality Constituent Units Highest Level Detected Range of Levels Detected Sample Year Likely Source of Detected Constituent
10. Sodium ppm 180 180 2006 Unknown

NOTE: Data presented in the above tables 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 Environmental Protection Agency 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 AIC.

Water Quality and Substances Contained In Source Water:

To ensure that tap water is safe to drink, the Environmental Protection Agency ("EPA") prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. The Food and Drug Administration ("FDA") regulations establish limits for contaminants in bottled water.

The sources of drinking 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.

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of various contaminants does not necessarily indicate the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the EPA's Safe Drinking Water Hotline (800-426-4791). Information on bottled water can be obtained from the FDA.

Information for Those with Special Health Needs:

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, persons with HIV, AIDS, or 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. EPA and Centers for Disease Control guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the EPA Safe Drinking Water Hotline (800426-4791 ).

Source Water Assessment Plan:

The Source Water Assessment Program ("SWAP"), developed and implemented by the Arizona Department of Environmental Quality ("ADEQ") under EPA guidance, was created to promote community awareness of water quality issues and to facilitate and encourage the protection of drinking water sources at the community level. Under SWAP, ADEQ evaluates all sources of water including wells, surface water intakes, and springs that provide drinking water to public water systems throughout Arizona. ADEQ gathers information on drinking water sources for a public water system and evaluates the extent to which the water source is vulnerable to natural or manĚ made contamination from sources. such as gas stations, landfills, dry cleaners, agriculture fields, waste water treatment plants, and mining activities. If a risk of contamination exists, protection measures can be implemented at the local level. ADEQ has evaluated the source water areas in Pima County including the source waters for the AIC PWS and has given a designation of low risk.

Residents can help protect sources by practicing good septic system maintenance, taking hazardous household chemicals to hazardous material collection sites, and limiting pesticide and fertilizer use.

The complete SWAP 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. Electronic copies are available from ADEQ at dml@azdea.gov. For more information, visit ADEQ's Source Water Assessment Protection Unit website at: www.azdea.gov/environ/water/dw/swap.html.

Information on Violations/Public Notifications: No violations occurred and no public notifications were required during the year 2007.

FLUORIDE: A monitoring waiver was granted to AIC for Fluoride and other Inorganic Chemicals for the year 2007 based on the sampling results from 2006.

During 2006 sampling, Fluoride concentration was detected to be greater than 2 mg/I but less than 4 mg/I. Pursuant to A.A.C. R18-4105 AIC has issued the following notification in 2006 CCR:

This notice is to inform AIC customers that from January to December 2006, AIC provided drinking water with fluoride concentrations greater than 2 mg/L, but less than 4 mg/L.

This is an alert about your drinking water and a cosmetic dental problem that might affect children under nine years of age. At low levels, fluoride can help prevent cavities, but children drinking water containing more than 2 milligrams per liter (mg/L) of fluoride may develop cosmetic discoloration of their permanent teeth (dental fluorosis). The drinking water provided by AIC has a fluoride concentration of 2.6 mg/L for 2006. Dental fluorosis, in its moderate or severe forms, may result in a brown staining and/or pitting of the permanent teeth. This problem occurs only in developing teeth, before they erupt from the gums. Children under nine should be provided with alternative sources of drinking water or water that has been treated to remove the fluoride to avoid the possibility of staining and pitting of their permanent teeth. You may also want to contact your dentist about proper use by young children of fluoride-containing products. Older children and adults may safely drink the water. Drinking water containing more than 4 mg/L of fluoride (the U.S. Environmental Protection Agency's drinking water standard) can increase your risk of developing bone disease. However, your drinking water does not contain more than 4 mg/L of fluoride, but we're required to notify you when we discover that the fluoride levels in your drinking water exceed 2 mg/L because of this cosmetic dental problem. For more information, please call AIC at (520) 387-7151. Some home water treatment units are also available to remove fluoride from drinking water. To learn more about available home water treatment units, you may call NSF International at 1-877-8-NSF-HELP.


Action Level (AL) The concentration of a contaminant that, if exceeded, triggers treatment or other requirements that a community water system shall follow.
Inorganic Chemicals Chemical substances of mineral origin, such as lead and copper.
Maximum Contaminant Level (MCL) The highest level of a constituent 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 constituent in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
Microbiological Contaminants 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.
Organic Contaminants Naturally occurring or synthetic substances containing mainly carbon, hydrogen, nitrogen and oxygen. This includes most pesticides and industrial chemicals.
pCi/L Picocuries per liter.
Point-of-Entry The point at which water is discharged into the distribution system from a well, storage tank, pressure tank, or water treatment plant.
ppb Parts per billion, or one microgram per liter (µg/l)
ppm Parts per million, or one milligram per liter (mg/l)
Radionuclides Contaminants giving off ionizing radiation.
Treatment Technique A required process intended to reduce the level of a contaminant in drinking water

Index of CCRs

Ajo Water Index




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