| Great Bay | EPA # 1732030 | ||||||||
| Microbiological Contaminants | Highest # Positive in a month | MCL | MCLG | Violation Yes/No | Typical Source of Contaminant | ||||
| Total Coliform Bacteria | 1 in July | 1 | 0 | NO | Naturally present in the environment | ||||
| Inorganic Contaminants | Date Collected | Highest Detect | Range Detected | MCL or MRDL | MCLG or MRDLG | Violation Yes/No | Typical Source of Contaminant | ||
| Barium (ppm) | 1/24/08 | 0.016 | N/A | 2 | 2 | No | Erosion of natural deposits | ||
| Fluoride (ppm) | 1/24/08 | 0.28 | N/A | 4 | 4 | No | Erosion of natural deposits | ||
| Nitrate as Nitrogen (ppm | 2/25/10 3/4/10 | 0.62 | nd - 0.62 | 10 | 10 | No | Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. | ||
| Sodium (ppm) | 1/24/08 | 18.9 | N/A | Not Regulated | N/A | Natural sources; runoff from use as salt on roadways; by-product of treatment process | |||
| Radiological Contaminants | |||||||||
| Compliance Gross Alpha (pCi/L) | 2004 | 2.3 | 1.0 - 2.3 | 15 | 0 | No | Erosion of natural deposits | ||
| Radium 226 & 228 (pCi/L) | 2004 | 1.5 | 0.2 - 1.5 | 5 | 0 | No | Erosion of natural deposits | ||
| Uranium (ppb) | 2004 | 1.9 | 0.6 - 1.9 | 30 | 0 | No | Erosion of natural deposits | ||
| Radon (pCi/L) | 4/21/10 | 1,730 | N/A | Not Regulated | N/A | 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) | 7/24/09 | 8.5 | 15 | 0 | 5 | 0 | No | Corrosion of household plumbing system | |
| Copper (ppm) | 7/24/09 | 0.104 | 1.3 | 1.3 | 5 | 0 | No | Corrosion of household plumbing system | |
| What is the source of my drinking water? | |||||||||
| The source of the Great Bay water supply is 2 wells and pump house located between Turkey Ridge Road and Schanda Drive in Newmarket, NH. Bedrock Well # 1 is located 840 feet northeast of the pump house. Bedrock Well # 3 is located 700 feet northeast of the pump house. Current treatment consists of ultraviolet light to kill bacteria and phosphates to help sequester iron and manganese. | |||||||||
| Source Water Assessment Summary | |||||||||
| Summary of Susceptibility Factors | |||||||||
| Source Name | Date | Low | Med | High | |||||
| Bedrock Well # 1 | 11/26/01 | 9 | 1 | 2 | |||||
| Bedrock Well # 3 | 11/26/01 | 9 | 1 | 2 | |||||
| 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 | |||||||||