| Pennichuck Water Works | EPA # 1621010 | ||||||||
| Microbiological Contaminants | Highest % Positive in a month | MCL | MCLG | Violation Yes/No | Typical Source of Contaminant | ||||
| Total Coliform Bacteria | 2.0 % in September 2010 | >5% | 0 | No | Naturally present in the environment | ||||
| Turbidity | TT | Lowest Monthly % of Samples | Highest Detected Daily Value | Violation Yes/No | Typical Source of Contaminant | ||||
| Daily Compliance (NTU) | 5 | ----------- | 0.30 on 3/29/2010 | No | Soil Runoff | ||||
| Monthly Compliance* | At least 95% | 99.87 - March 2010 | ----------- | No | |||||
| Turbidity is a measure of the cloudiness of the water. We monitor it because it is a good indicator of water quality. | |||||||||
| *Monthly turbidity compliance is related to a specific treatment technique (TT). Our system filters the water so at least 95% of our samples each month must be below the turbidity limits specified in the regulations. | |||||||||
| Inorganic Contaminants | Date Collected | Highest Detect | Range Detected | MCL or MRDL | MCLG or MRDLG | Violation Yes/No | Typical Source of Contaminant | ||
| Nitrate as Nitrogen (ppm | 2010 | 0.86 | <0.2-0.86 | 10 | 10 | NO | Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits. | ||
| Total Organic Carbon (ppm) | 2010 | 1.2 | <0.09-3.0 | TT | n/a | NO | Naturally present in the environment | ||
| Sodium (ppm) | 2010 | 41.9 | 28.1 - 41.9 | Not Regulated | Natural sources; runoff from use as salt on roadways | ||||
| Volatile Organic Contaminants | |||||||||
| Chlorine (ppm) | 2010 | 0.66 Avg | 0.02 - 1.56 | 4 | 4 | NO | Water additive used to control microbes | ||
| Total Trihalomethanes (ppb) | 2010 | 21.7 Avg | 3.9 - 58 | 80 | n/a | NO | By-product of drinking water chlorination | ||
| Haloacetic Acids (ppb) | 2010 | 6.2 Avg | 1.9 - 13 | 60 | n/a | NO | By-product of drinking water chlorination | ||
| Radiological Contaminants | |||||||||
| Compliance Gross Alpha (pCi/L) | 2005 | 5.9 | nd-5.9 | 15 | 0 | NO | Erosion of natural deposits | ||
| Uranium (ppb) | 2005 | 0.6 | 0.1-0.6 | 30 | 0 | NO | Erosion of natural deposits | ||
| Radium 226 & 228 (pCi/L) | 2005 | 0.6 | nd-0.6 | 5 | 0 | NO | Erosion of natural deposits | ||
| Radon (pCi/L) | 4/17/2008 | 654 | nd - 654 | Not Regulated | 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) | 9/2008 | < 5 | 15 | 0 | 32 | 0 | No | Corrosion of household plumbing system | |
| Copper (ppm) | 9/2008 | 0.064 | 1.3 | 1.3 | 32 | 0 | No | Corrosion of household plumbing system | |
| What is the source of my drinking water? | |||||||||
| Our watershed is a 27.5 square mile area from which rainfall drains, becoming a source for the Pennichuck Brook, and ultimately, the Pond System. This is Pennichuck's primary source of water, accounting for about 75% of our total annual supply. Other supplementary sources of water are the Bon Terrain Well, in Amherst, NH, the Amherst Village District well in Amherst, NH (this well was not used during 2009), and the Merrimack River, which is used primarily during the summer months. | |||||||||
| Source Water Assessment Summary | |||||||||
| Summary of Susceptibility Factors | |||||||||
| Source Name | Date | Low | Med | High | |||||
| Harris Pond Reservoir | 7/5/01 | 6 | 3 | 2 | |||||
| Supply Pond / Springs | 7/5/01 | 6 | 3 | 2 | |||||
| Merrimack River | 10/25/01 | 2 | 4 | 5 | |||||
| Bon Terrain Well | 10/30/00 | 8 | 1 | 3 | |||||
| Amherst Village District Well | 10/30/00 | 7 | 3 | 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 | |||||||||