Water Quality


The tables below summarize the finish water quality from the Town's water treatment plants.  Iron should be less than 0.3 mg/l, manganese less than 0.05 mg/l, color less than 15 color units.  Turbidity is a measure of the cloudiness of the water:

Pond Street Water Treatment Plant

Year and Month pH Iron (mg/l) Manganese (mg/l) Color (units) Turbidity (NTU) Free Chlorine (mg/l) Total Chlorine (mg/l) Finished Water Gallons
01-2017 7.76 0.013 0.029 1.2 0.06 1.04 1.26 27,409,299
02-2017 7.85 0.011 0.032 1.0 0.07 1.02 1.19 21,875,548
03-2017 7.80 0.012 0.033 0.9 0.06 0.93 1.12 25,574,548
04-2017 7.77 0.012 0.033 0.9 0.07 0.97 1.14 28,492,120
05-2017 7.80 0.010 0.044 1.7 0.07 0.92 1.07 26,831,650
06-2017 7.79 0.011 0.053 2.4 0.08 0.89 1.06 30,010,867
07-2017 7.84 0.011 0.060 3.4 0.09 0.94 1.18 30,126,389
08-2017 7.74 0.013 0.042 2.6 0.09 1.03 1.27 30,579,503
09-2017 7.74 0.013 0.041 1.3 0.08 1.04 1.29 23,940,561
10-2017 7.80 0.015 0.041 1.4 0.08 1.12 1.35 23,540,561
11-2017 7.77 0.012 0.044 2.6 0.08 1.15 1.39 18,384,853
12-2017 7.71 0.011 0.037 1.1 0.07 1.13 1.29 15,853,440
01-2018 7.68 0.011 0.038 0.9 0.07 1.05 1.25 19,433,696
02-2018 7.76 0.012 0.033 0.8 0.06 1.05 1.26 17,688,112
03-2018 7.88 0.012 0.030 0.8 0.07 1.14 1.36 24,119,628
04-2018 7.74 0.010 0.025 1.1 0.07 1.05 1.33 25,514,482
05-2018 7.75 0.010 0.032 2.1 0.07 1.12 1.39 30,861,841
06-2018 7.72 0.012 0.040 2.2 0.08 1.18 1.41 32,411,164
07-2018 7.74 0.013 0.037 2.1 0.08 1.18 1.47 33,864,240
08-2018 7.77 0.015 0.031 1.9 0.10 1.15 1.48 30,960,464
09-2018 7.85 0.016 0.039 2 0.09 1.18 1.51 27,366,894
10-2018 7.89 0.019 0.039 3 0.12 1.15 1.48 22,912,342


Beal Water Treatment Plant

Year and Month pH Iron (mg/l) Manganese (mg/l) Color (units) Turbidity (NTU) Free Chlorine (mg/l) Total Chlorine (mg/l) Finished Water Gallons
01-2017 7.66 0.033 0.013 0.8 0.09 0.84 0.97 4,741,778
02-2017 7.68 0.028 0.017 1.0 0.09 1.01 1.13 5,819,262
03-2017 7.68 0.025 0.014 0.2 0.08 0.89 1.06 8,117,179
04-2017 7.69 0.021 0.017 1.1 0.08 0.94 1.09 7,277,961
05-2017 7.69 0.023 0.019 0.3 0.07 0.97 1.10 7,987,268
06-2017 7.70 0.018 0.016 0.4 0.08 0.92 1.05 8,498,247
07-2017 7.66 0.024 0.016 0.2 0.09 0.89 1.03 8,714,340
08-2017 7.64 0.019 0.015 0.1 0.09 0.84 0.95 7,694,384
09-2017 7.63 0.022 0.019 0.5 0.08 0.86 0.96 7,295,911
10-2017 7.66 0.019 0.025 0.3 0.07 0.96 1.09 7,213,934
11-2017 7.68 0.025 0.012 0.4 0.07 0.99 1.16 7,527,572
12-2017 7.71 0.029 0.013 0.2 0.07 0.94 1.10 7,906,017
01-2018 7.71 0.022 0.014 0.1 0.08 1.01 1.18 7,726,863
02-2018 7.67 0.022 0.014 0.3 0.08 0.99 1.16 7,513,908
03-2018 7.67 0.023 0.011 0 0.08 1.02 1.20 2,952,012
04-2018
DID
NOT
RUN
Did not run Did not run Did not run Did not run
05-2018 7.61 0.044 0.025 0.2 0.11 1.12 1.40 2,917,588
06-2018 7.60 0.036 0.019 0.2 0.10 1.08 1.23 9,746,810
07-2018 7.61 0.027 0.023 0.5 0.10 1.07 1.26 10,775,193
08-2018 7.57 0.027 0.022 0.5 0.10 1.05 1.25 9,096,104
09-2018 7.58 0.024 0.023 0 0.10 1.11 1.35 6,218,653
10-2018 7.59 0.028 0.021 1 0.09 1.19 1.43 8,513,241


Broadway Water Treatment Plant

Year and Month pH Iron (mg/l) Manganese (mg/l) Color (units) Turbidity (NTU) Free Chlorine (mg/l) Total Chlorine (mg/l) Finished Water Gallons
01-2017 7.75 0.025 0.013 0 0.08 0.96 1.02 5,100,170
02-2017 7.85 0.025 0.016 1.0 0.10 0.85 0.97 5,810,353
03-2017 7.88 0.021 0.030 1.1 0.11 0.75 0.92 4,342,840
04-2017 8.06 0.013 0.031 0.4 0.12 0.99 1.10 1,356,950
05-2017 7.79 0.017 0.026 0.5 0.09 1.01 1.15 10,050,148
06-2017 7.77 0.020 0.017 0.8 0.10 0.93 1.08 9,389,497
07-2017 7.75 0.026 0.030 0.8 0.09 0.92 1.07 10,986,511
08-2017 7.84 0.026 0.017 0.1 0.09 0.93 1.07 14,650,549
09-2017 7.81 0.028 0.014 0.4 0.09 0.88 1.02 12,243,694
10-2017 7.64 0.022 0.015 0.3 0.08 0.94 1.10 7,794,088
11-2017 7.71 0.019 0.018 0.6 0.08 0.93 1.15 7,124,984
12-2017 7.69 0.027 0.014 0.3 0.08 0.93 1.10 9,721,707
01-2018 7.73 0.026 0.013 0.4 0.08 0.90 1.09 10,959,586
02-2018 7.68 0.023 0.014 0.3 0.09 0.96 1.16 8,665,393
03-2018 7.66 0.025 0.016 0.1 0.08 0.90 1.09 10,250,119
04-2018 7.65
0.022
0.012
0.3
0.07
0.99
1.13
12,716,259
05-2018 7.73 0.025 0.012 0.2 0.08 1.18 1.37 12,010,194
06-2018 7.76 0.022 0.022 0.3 0.08 1.14 1.33 11,847,544
07-2018 7.70 0.020 0.017 0.3 0.09 1.14 1.35 9,832,427
08-2018 7.71 0.028 0.013 0.3 0.09 1.12 1.32 9,740,407
09-2018 7.75 0.017 0.014 0 0.08 1.11 1.31 9,118,909
10-2018 7.79 0.028 0.015 1 0.09 1.15 1.34 6,830,890




(Under Construction: Description of iron, manganese and color..............)

(Under Construction: Links to overall test result spreadsheets..............)

                    Click here for listing of General Water Quality Data (PDF)


Disinfection Byproducts

The Town is currently working to reduce disinfection byproducts which form when chlorine in the water reacts over time with residual organic material that is also in the water.  We are currently in violation of Federal standards for total trihalomethanes (TTHM's) at one site in North Hanover.    Please click on the following link for more information about disinfection byproducts and what we are doing to try to reduce them in the town's water system.  Click here for the Disinfection Byproduct Page




Water Treatment Plants

The Pond Street Water Treatment plant is a conventional treatment plant designed to remove iron, manganese, organic color, and turbidity from the raw water.   The raw water quality varies depending on the combination of wells that are being used.  Readers of this page will see that the plant effectively and consistently removes iron and color.   Manganese is more challenging due to tight tolerances in water chemistry that are often in conflict with the color removal process.   The average raw water quality at Pond Street in 2018 has been 0.61 mg/l of manganese, 56 units of color, and 0.89 mg/l of iron.  The average finished water quality for the same period has been 0.033 mg/l of manganese, 2 units of color, and 0.012 mg/l of iron.  Our treatment goals are less than 0.15 mg/l of iron, less than 8 parts of color, and less that 0.05 mg/l of manganese.

The Beal Water Treatment plant is a manganese-greensand treatment plant designed to remove iron, manganese,  and turbidity from the raw water.   The raw water quality tends to be quite consistent from day to day. Readers of this page will see that the plant effectively and consistently removes iron, manganese, and color.    The average raw water quality at Beal in 2018 has been 1.05 mg/l of manganese, 33 units of color, and 3.29 mg/l of iron.  The average finished water quality for the same period has been 0.018 mg/l of manganese, 0 units of color, and 0.027 mg/l of iron.  Our treatment goals are less than 0.15 mg/l of iron, less than 8 parts of color, and less that 0.05 mg/l of manganese.

The Broadway Water Treatment plant is a manganese-greensand treatment plant designed to remove iron, manganese,  color and turbidity from the raw water.   The raw water quality tends to be quite consistent from day to day. Readers of this page will see that the plant effectively and consistently removes iron, manganese, and color.    The average raw water quality at Broadway in 2018 has been 0.46 mg/l of manganese, 39 units of color, and 0.73 mg/l of iron.  The average finished water quality for the same period has been 0.0.015 mg/l of manganese, 0 units of color, and 0.024 mg/l of iron.  Our treatment goals are less than 0.15 mg/l of iron, less than 8 parts of color, and less that 0.05 mg/l of manganese.

(Under Construction: Links to water treatment result histories in PDF format)

Raw and finished water quality data is also available for each of the Town's water treatment plants from our Open Data page.

                    Click here to go to the DPW's Open Data Page


Iron and Manganese

Iron and manganese are commonly found in groundwater in Massachusetts.  While the tratment plants do an excellent job removing the minerals, 1-2 percent of the iron and manganese typically pass through the plants.  Both minerals will react with chlorine to form oxides of the minerals and will typically settle out in the water distribution system.  During periods of higher flow such as a water break, during a fire, or when the summer consumption increases and flows increase in the pipes, the sediments can be lifted off of the bottom of the pipes and will discolor the water.  This discoloration is generally an aesthetic problem, causing staining on laundry and on plumbing fixtures.  To control the sediments and reduce the likelihood of problems, the Town flushes water mains in the spring and in the fall.   

Some scientific studies have shown that manganese in high concentrations can have health effects.  The normal concentraton of manganese in Hanover's water is typically 1/10th of the health advisory level.  The primary source of manganese intake in humans is from regular foods and as such manganese intake from the water is insignificant for most people.  However, infants often receive the bulk of their manganese nutrition through baby formula, not solid food.  As such, the EPA has issued a health advisory for excessive water based manganese when high levels of manganese in water it is used to make baby formula.  A link to the full text of the EPA's health advisory is here:  Click here for the EPA Health Advisory on Manganese

The Massachusetts Department of Environmental Protection has developed an excellent fact sheet on manganese in drinking water which summarizes the information provided in the EPA health advisory in simple terms.  The fact sheet is available through the following link:  MassDEP manganese fact sheet.

The Town urges residents to use common sense with respect to discolored water.  We recommend that residents run their faucets which will generally clear up the discolored water.  If the discoloration persists, please call the DPW office and we will investigate the source of the problem and weather permitting, will attempt to mitigate the issue.  We urge residents who may have concerns regarding manganese to read the MassDEP fact sheet and the EPA health advisory and to discuss their concerns with their health care provider.

Water Consumer Confidence Reports

The DPW is proactive in its quest to provide the highest quality of water possible. Please click on the following link for a narrative of the steps and tests that are performed to ensure the quality of the water over the past few years: 

2017 Consumer Confidence Report

2016 Consumer Confidence Report

2015 Consumer Confidence Report

2014 Consumer Confidence Report

2013 Consumer Confidence Report

2012 Consumer Confidence Report

2011 Consumer Confidence Report

2010 Consumer Confidence Report


EPA and Other Water Quality Links

EPA Drinking Water Standards and Regulations                        https://www.epa.gov/dwstandardsregulations 

Mass DEP Manganese Fact Sheet:                                              Mass DEP Manganese Fact Sheet 

EPA Safe Drinking Water Act Page:                                            https://www.epa.gov/sdwa


Home Drinking Water Treatment System Resources

EPA Home Drinking Water Filtration Fact Sheet:                        https://www.epa.gov/ground-water-and-drinking-water/home-drinking-water-filtration-fact-sheet//www.epa.gov/sdwa

NSF Home Drinking Water Filtration Guide:                                 http://www.nsf.org/consumer-resources/water-quality/water-filters-testing-treatment/home-water-treatment-system-selection

Consumer Reports Water Filter Buying Guide:                             https://www.consumerreports.org/cro/water-filters/buying-guide/index.htm