Refer to notes  for explanation of units, definitions, and abbreviations.

Text in green is language required by the US Environmental Protection Agency.

Copper and Lead
This sampling program began in May 2005.

Radiological

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Average
Radon	pCi/L	200-471	326.0	4,000	300	2003-04	Erosion of natural deposits.

Other Radiochemistry samples will be collected in 2005.

Radon is a radioactive gas that you cannot see, taste, or smell. It is found throughout the United States. Radon can move up through the ground and into a home through cracks and holes in the foundation. Radon can build up to high levels in all types of homes. Radon can also get into indoor air when released from tap water from showering, washing dishes, and other household activities. Compared to radon entering the home through soil, radon entering the home through tap water will in most cases be a small source of radon in indoor air. Radon is a known human carcinogen. Breathing air containing radon can lead to lung cancer. Drinking water containing radon may also cause increased risk of stomach cancer. If you are concerned about radon in your home, test the air in your home. Testing is inexpensive and easy. For additional information, call your state radon program or call EPA’s Radon Hotline (800-SOS-RADON).

Disinfection Byproducts
This sampling program begins in August 2005.

Analyte	Units	Groundwater Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Average
Arsenic	mg/L	0.005*	0.005*	0.05	0	2004	Erosion of natural deposits.
Barium	mg/L	0.03*	0.03*	2	2	2004	Erosion of natural deposits.
Fluoride	mg/L	0.3*	0.3*	4	NA	2004	Erosion of natural deposits.
Nitrate	mg/L	1.5*	1.5*	10	10	2004	Fertilizer runoff, erosion of natural deposits.

Tested for but not found : Asbestos; Antimony; Beryllium; Cadmium; Cyanide; Mercury; Nitrite; Selenium; Thallium

*One sample collected, as required.

Arsenic Information: The City of Peoria water system 07-520 (Vistancia) obtained 100% of its water from groundwater wells during 2004. Some of these wells contain arsenic near the new MCL of 10 μg/L that goes into effect in 2006. Peoria has evaluated its arsenic treatment options this year and is developing a compliance strategy.

Due to the variation of the arsenic concentration, the City is providing the following statement as required by the US Environmental Protection Agency (EPA):

Arsenic Educational Statement: While your drinking water meets EPA’s standard for arsenic, it does contain low levels of arsenic. EPA’s standard balances the current understanding of arsenic’s possible health effects against the costs of removing arsenic from drinking water. EPA continues to research the health effects of low levels of arsenic, which is a mineral known to cause cancer in humans at high concentrations and is linked to other health effects such as skin damage and circulatory problems.