2007

The source of the Ministerial water supply is two wells and a pump station located on Faye Lane in Derry, NH.  Well # 1 is located 550 feet northwest of the pump house.  Well # 2 is located 610 feet northwest of the pump house.  Treatment consist of chlorine addition to kill bacteria, aeration to remove radon in water, phosphate addition to sequester iron and manganese.
MINISTERIAL
EPA # 1392310
Microbiological Contaminants	Units	MCLG	MCL	Highest monthly # of positive samples		Month	Violation Yes/No	Typical Source of Contaminant
Total Coliform Bacteria	Positive/Negative	Negative	> 1 positive per month	16		OCT	YES	Naturally present in the environment
Health Effects for Total Coliform Bacteria: Coliforms are bacteria which are naturally present in the environment and are used as an indicator that other, potentially-harmful, bacteria may be present.  Coliforms were found in more samples than allowed and this was a warning of potential problems.  A full time chlorination system was installed to take care of this problem.
Inorganic Contaminants	Units	MCLG	MCL	Level Detected	Range	Year	Violation Yes/No	Typical Source of Contaminant
Fluoride	ppm	4	4	1.21	n/a	2004	NO	Erosion of natural deposits
Radiological Contaminants	Units	MCLG	MCL	Level Detected	Range	Year	Violation Yes/No	Typical Source of Contaminant
Gross Alpha (Compliance)	pCi/L	0	15	2.8	1.5 to 2.8	2005	NO	Erosion of natural deposits
Combined Radium	pCi/L	0	5	1.7	1.2 to 1.7	2005	NO	Erosion of natural deposits
Uranium	ppb	0	30	3.1	1.9 to 3.1	2005	NO	Erosion of natural deposits
Radon	pCi/L	Not Regulated		2,370	1,560 - 2,370	2006	n/a	Erosion of natural deposits
Radon is a radioactive gas that you can't see, taste or smell.  It can move up through the ground and into a home through cracks and holes in the foundation.  Radon can also get into indoor air when released from tap water from showering, washing dishes, and other household activities.  It is a known human carcinogen.  Breathing radon can lead to lung cancer.  Drinking water containing radon may cause an increased risk of stomach cancer.  Presently EPA is reviewing a standard for radon in water.
Volatile Organic Contaminants	Units	MRDLG	MRDL	Average Level  Detected	Range	Year	Violation Yes/No	Typical Source of Contaminant
Chlorine	ppm	4	4	0.2	0.0 - 0.2	2006	NO	Water additive used to control microbes
Inorganic Contaminants	Units	MCLG	AL	90th percentile sample value	# sites above AL	Year	Violation Yes/No	Typical Source of Contaminant
Copper	ppm	1.3	1.3	0.17	0 of 5	2006	NO	Corrosion of household plumbing system
Source Assessment Information
		Summary of Susceptibility Factors
Source Name	Date	Low	Med	High
Bedrock Well # 1	3/15/02	11	1	0
Bedrock Well # 2	3/15/02	11	1	0
The complete Assessment Report is available for inspection.  For more information call Gary Tetley or visit NH DES's Drinking Water Source Assessment Program web site at www.des.state.nh.us/dwspp