| Avery | EPA # 1392250 | ||||||||
| Inorganic Contaminants | Date Collected | Highest Detect | Range Detected | MCL or MRDL | MCLG or MRDLG | Violation Yes/No | Typical Source of Contaminant | ||
| Fluoride (ppm) | 1/12/10 | 0.27 | N/A | 4 | 4 | No | Erosion of natural deposits | ||
| Nitrate as Nitrogen (ppm | 1/12/10 | 0.24 | N/A | 10 | 10 | No | Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. | ||
| Sodium (ppm) | 1/12/10 | 35.2 | N/A | Not Regulated | N/A | Natural sources; runoff from use as salt on roadways; by-product of treatment process | |||
| Volatile Organic Contaminants | |||||||||
| Chlorine (ppm) | 2010 | 0.48 Avg | 0.3 - 0.8 | 4 | 4 | No | Water additive used to control microbes | ||
| Total Trihalomethanes (ppb) | 8/4/10 | 10 | N/A | 80 | 0 | No | By-product of drinking water chlorination | ||
| Haloacetic Acids (ppb) | 8/4/10 | 1.3 | N/A | 60 | 0 | No | By-product of drinking water chlorination | ||
| Radiological Contaminants | |||||||||
| Compliance Gross Alpha (pCi/L) | 2006 | 2.1 Avg | nd - 5 | 15 | 0 | No | Erosion of natural deposits | ||
| Uranium (ppb) | 2006 | 0.5 Avg | 0.2 - 1.1 | 30 | 0 | No | Erosion of natural deposits | ||
| Radium 226 & 228 (pCi/L) | 2006 | 13.3 Avg | nd - 37 | 5 | 0 | No | Erosion of natural deposits | ||
| Date Collected | 90th Percentile | Action Level | MCLG | # of Sites Sampled | # Sites Above Action Level | Violation Yes/No | Typical Source of Contaminant | ||
| Lead (ppb) | 7/23/09 | < 5 | 15 | 0 | 6 | 0 | No | Corrosion of household plumbing system | |
| Copper (ppm) | 7/23/09 | 0.236 | 1.3 | 1.3 | 6 | 0 | No | Corrosion of household plumbing system | |
| What is the source of my drinking water? | |||||||||
| The source of the Avery water supply consists of two wells and a pump house located off Rossini Road in Londonderry, NH. Well #1 is 75' southeast of the pump house and well # 2 is 350' southeast of the PH. Treatment consists of chlorine addition for disinfection, arsenic removal, softeners for hardness removal, phosphate addition to control corrosion and sequester iron and manganese, aeration for radon removal, and bag filters for sediment removal. | |||||||||
| Source Water Assessment Summary | |||||||||
| Summary of Susceptibility Factors | |||||||||
| Source Name | Date | Low | Med | High | |||||
| Bedrock Well # 1 - 001 | 9/20/01 | 9 | 2 | 1 | |||||
| Bedrock Well # 2 - 002 | 3/12/02 | 8 | 3 | 1 | |||||
| The complete Assessment Report is available for review. For more information call Gary Tetley at 800-553-5191 ext. 2378 or visit NH Department of Environmental Services Drinking Water and Groundwater Bureau web site at http://www.des.nh.gov/organization/divisions/water/dwgb/dwspp/reports/index.htm | |||||||||