Water Quality Data

The data presented on the following pages provide a detailed microbiological and chemical analysis of Peoria’s water supply for calendar year 2007, during which Peoria supplied water through three different systems. Data from the Central Area and the Vistancia Area water systems are reported separately. Peoria water customers west of the Agua Fria River and north of the Loop 303/Happy Valley Road alignment received water from the Vistancia Area system; most other Peoria water customers received water from the Central Area system. Should you have other water quality questions, contact us at utilities@peoriaaz.gov or 623-773-7286.

Aesthetics

Analyte	Units	Groundwater Concentrations		Greenway Surface Water Concentrations		Pyramid Peak Surface Water Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Average	Range	Average	Range	Average
Alkalinity	mg/L	101-213	157	119-194	145	NR	NR	NA	NA	2007	Naturally present
Calcium	mg/L	13-51	36	60*	60*	NR	NR	NA	NA	2007	Erosion of natural deposits
Hardness	Gr/gal	3.8-15.1	9.5	15*	15*	NR	NR	NA	NA	2007	Naturally present
Magnesium	mg/L	8-32	18	26*	26*	NR	NR	NA	NA	2007	Erosion of natural deposits
Manganese	mg/L	ND	ND	ND*	ND*	NR	NR	NA	0.05	2007	Naturally present
pH	pH	7.3-8.8	7.9	7.7-8.0	7.9	NR	NR	NA	NA	2007	NA
Total Dissolved Solids	mg/L	201-463	297.0	543*	543*	NR	NR	NA	NA	2007	Naturally present
Sulfate	mg/L	26-48	35	150*	150*	NR	NR	NA	250	2007	Naturally present
Sodium	mg/L	28-72	40	129*	129*	NR	NR	NA	NA	2007	Naturally present

*One sample collected, as required.

Copper and Lead

Analyte	Units	90th Percentile Reported	EPA Action Level (AL) mc/L	EPA Limit MCLG	Sample Date	Number of sites above AL	Possible Sources
Copper	mg/L	0.29	1.3	1.3	2007	Zero	Erosion of natural deposits Home plumbing systems
Lead	ug/L	4	15	0	2007	Zero	Erosion of natural deposits Home plumbing systems

Disinfection Byproducts

Analyte	Units	Groundwater Concentrations		Greenway Surface Water Concentrations		Pyramid Peak Surface Water Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest Average	Range	Highest Average	Range	Highest
Bromate*	ug/L	NR	NR	ND-11*	0.72*	NR	NR	10	0	2007	By-product of drinking water ozonation
Total Organic Carbon % removal	mg/L	NR	NR	11-55%	42%(15% required)	NR	NR	TT	NA	2007	Naturally present in the environmnet
Total Trihalomethanes	ug/L	ND-61	45*	NR	NR	NR	NR	80*	NA	2007	By-product of drinking water chlorination
Total Haloacetic Acids	ug/L	ND-21	12*	NR	NR	NR	NR	60*	NA	2007	By-product of drinking water chlorination

*A single analysis about the MCL is not a violation. Compliance is determined on a running annual average.

Inorganics

Analyte	Units	Groundwater Concentrations		Greenway Surface Water Concentrations		Pyramid Peak Surface Water Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	Possible Sources
		Range	Highest	Range	Highest	Range	Highest
Arsenic*	ug/L	ND-12*	5*	ND-6	4*	1.1	1.1	10	0	2007	Erosion of natural deposits
Barium	mg/L	0.01-0.08	0.08	0.08	0.08	150	150	2	2	2007	Erosion of natural deposits
Cadmium	ug/L	ND	ND	0.4	0.4	ND	ND	5	5	2007	Erosion of natural deposits
Chromium	ug/L	ND-20	20	ND	ND	ND	ND	100	100	2007	Erosion of natural deposits
Fluoride	mg/L	ND-0.94	0.94	0.6-0.72	0.72	0.35	0.35	4	NA	2007	Erosion of natural deposits
Nitrate	mg/L	ND-9.7	9.7	ND-2.6	2.6	ND	ND	10	10	2007	Fertilizer runoff, erosion of natural deposits

Nitrate: The City of Peoria has five wells with nitrate concentrations about 5.0 mg/L but less than the MCL of 10 mg/L.  Nitrate in drinking water at levels above 10 mg/L is a health risk for infants of less than six months of age. High nitrate levels in drinking water can cause blue baby syndrome. Nitrate levels may rise quickly for short periods of time because of rainfall or agricultural activity. If you are caring for an infant, ask advice from your health care provider.

Arsenic Information: The City of Peoria obtained 28% of its water from groundwater wells during 2007. Some of these wells contain arsenic above a new MCL of 10 ug/L that was effective January 23, 2006. Peoria has evaluated its arsenic treatment options and developed a compliance strategy.

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

Arsenic Education Statement: While your drinking water meets EPA's standards 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 human at high concentrations and is linked to other health effects such as skin damage and circulatory problems.

Arsenic Health Effects Statement: Some people who drink water containing arsenic in excess of the MCL over many years could experience skin damage or problems with their circulatory system, and may have an increased risk of getting cancer.

*Arsenic MCL is determined using running annual average.

Other Analysis

Analyte	Units	Water System Concentrations		Greenway Surface Water Concentrations		Pyramid Peak Surface Water Concentrations		EPA Limit MCL	EPA Limit MCLG	Sample Date	EPA Limit MRDL	Possible Sources
		Range	Highest	Range	Highest	Range	Highest
Total Coliforms	P/A	0-0.7%	0.7%	0.00%	0.00%	0.00%	0.00%	15% of Monthly samples are positive	0	2007	NA	Naturally Present
Chlorine Residual	mg/L	0.43-1.73	1.73	1.1-1.69	1.69	1.13-1.5	1.5	4	4	2007	4	Water additive used to control microbes

Giardia and Cryptosporidium were tested for, but not found at Pyramid Peak and Greenway Water Treatments Plants.