| The source of the Richardson water supply is one well located off Richardson Road in Derry, NH. The well is located 20 feet north of the pump house. The water does not require treatment. | |||||||||
| RICHARDSON | |||||||||
| EPA # 0612130 | |||||||||
| Inorganic Contaminants | Units | MCLG | MCL | Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | |
| Fluoride | ppm | 4 | 4 | 0.39 | n/a | 2006 | NO | Erosion of natural deposits | |
| Radiological Contaminants | Units | MCLG | MCL | Highest Level Detected | Range | Year | Violation Yes/No | Typical Source of Contaminant | |
| Gross Alpha (Compliance) | pCi/L | 0 | 15 | 8.4 | nd to 8.4 | 2005 | NO | Erosion of natural deposits | |
| Combined Radium | pCi/L | 0 | 5 | 2.5 | 0.9 to 2.5 | 2005 | NO | Erosion of natural deposits | |
| Uranium | ppb | 0 | 30 | 5.1 | 1.0 to 5.1 | 2005 | NO | Erosion of natural deposits | |
| Radon | pCi/L | Not Regulated | 1,760 | n/a | 2003 | 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. | |||||||||
| 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 | 0.15 | 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 | 11/3/00 | 10 | 2 | 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 | |||||||||