Rates-water.htm

Rates-water.htm Home Page

Water Quality- CCR

KEY TO TABLE AL = Action Level TT = Treatment Technique MCL = Maximum Contaminant Level MCLG = Maximum Contaminant Level Goal						NTU = Nephelometric Turbidity Units pCi/l– picocuries per liter (a measure of radioactivity) ppm= parts per million, or milligrams per liter (mg/l) ppb= parts per billion, or micrograms per liter (ug/l)
Contaminant	Date Tested	Unit	MCL	MCLG	Average Detected Levels		Range	Major Sources	Violation
Inorganic Contaminants
Nitrate	2007	ppm	10	10	0.44		0.16-0.78	Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits	NO
Copper	2005	ppm	AL=1.3 TT	1.3	90th per- centile=0		0 Sites>AL	Corrosion of household plumbing systems; erosion of natural deposits	NO
Lead	2005	ppm	AL=15 TT	0	90th per- centile=12		3 Sites>AL	Corrosion of household plumbing systems; erosion of natural deposits	NO
Microbiological Contaminants
Total Coliform	2007	% Samples	5	0	1.2 (Max)		0-1.2	Naturally present in the environment	NO
Turbidity ¹	2007	NTU	95% Samples <0.3 NTU TT	0	0.069 (Avg) 0.32 (Max)		99.7+% Samples <0.3 NTU	Soil runoff	NO
Disinfection Byproducts
TTHMs Total Trihalomethanes)	2007	ppb	80	N/A	44 (Max)		37-44 (regulatory rolling average)	By-product of drinking water disinfection	NO
HAAs (Haloacetic Acids)	2007	ppb	60	N/A	33(Max)		29-33 (regulatory rolling average)	By-product of drinking water disinfection	NO
Chlorine	2007	ppm	4.0 (MRDL)	4.0 (MRDLG)	2.0		1.3-2.7	Added as oxidant/disinfectant	NO
Chlorine Dioxide	2007	ppb	800 (MRDL)	800 (MRDLG)	0.6		0-114	Added as oxidant/disinfectant	NO
Chlorite	2007	ppm	1	0.8	0.38		0.012-0.99	By-product of chlorine dioxide disinfection	NO
¹ Turbidity is a measure of the cloudiness of water and it is a good indicator of the effectiveness of the filtration system. See advice about special populations and a source of further information.

The chart above provides representative analytical results of water samples routinely collected in 2007 from the authority's system. Please note the following definitions:

Maximum Contaminant Level (MCL)
The highest level of 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.

Treatment Technique (TT)
A required process intended to reduce the level of contaminants in drinking water.

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

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 contamination.