Merrimack watershed bacteria results: August 27, 2024
Dear river and watershed friends,
August 27, our sixth and final sampling day capped the with 100% sampling at 100% of our sites. Thank you, volunteers. We continue to provide you with these bi-weekly reports for eleven sites from Franklin to Bow, comprising the Pemigewasset, Winnipesaukee, Contoocook, and Merrimack Rivers.
We know that you have heard it before but it’s important to remember that the results shown below are the probable number of E. coli colonies for every 100 millilitres (ml) of water at that moment in time. We call it a snapshot because conditions at that moment are represented and anything that happened a day or so before or after this sampling date can change drastically. All warm blooded animals (including we humans) have E. coli in their guts. That means that bacteria are an indicator that poop has found its way to the water. This could be a result of stormwater runoff, failed septic systems, mis-connected pipes that are meant to transport household waste to a treatment plant, pet or wildlife waste from river watershed, and other sources.
To protect public health, State of New Hampshire designated swim beaches are not allowed to exceed 88 colonies of E. coli per 100ml. Class B waters (all of our sites are designated as Class B) shall not exceed 406 colonies. These designations do not always reflect real-time water quality. The designation indicates what uses, e.g., swimming, fishing, should be supported by maintaining water quality.
All sites meet the requirements of the Class B Standard for swimmable, fishable waters. All but one meet the designated swim beach requirements (this is not a standard for any of our sites but good to see when they meet this more stringent requirement). Anything can happen right before or after these samples are taken so we continue to stress that these samples are snapshots in time, and something can happen right before or right after volunteers take these samples. These data are important for trend analysis and to help us understand correlations between weather and bacteria counts. Leonardo da Vinci said it best, “When you put your hand in a flowing stream, you touch the last that has gone before and the first of what is still to come.”
A correspondent from the Laconia Sun visited the program this week. He took pictures and talked to Mike Hamilton, Site 1 Watts Water in Franklin, and to us about the Upper Merrimack Monitoring Program, Upper Merrimack Watershed Association, the dedicated volunteers, and our Adopt-a-River site sponsors. Watch for the story at your local newsstand and online.
You hear us say often, “When it rains, it’s poor,” which means that you may wish to wait a day or so after it rains before recreating in a surface water.
Here are the details.
Site number and description | results |
#1 Pemigewasset at Route 3, Franklin | <10 |
#2 Winnipesaukee at Trestle, Franklin | 86 |
#3 Merrimack R. above FWWTF, Franklin | 41 |
#4 Merrimack R. below FWWTF, Franklin | 74 |
#5 Merrimack at Jamie Welch, Boscawen | 20 |
#6 Merrimack at US Route 4, Canterbury | 63 |
#7 Contoocook at Rivco, Penacook | 120 |
#8 Merrimack at Sewalls Falls, Concord | 41 |
#9 Merrimack at Manchester St., Concord | 63 |
#10 Merrimack at Blue Seal, Bow | 75 |
#11 Merrimack at Garvins Falls, Bow | 10 |
Please join us in recognizing and thanking our Adopt-a-River Site Sponsors and municipal supports who make this work possible
Adopt-a-River Sponsors are listed in order of their sponsored sites 1-11.
Watts Regulator / Webster Valve
Franklin Savings Bank
Winnipesaukee River Basin Program (two sites)
Elektrisola
Nelson Analytical
Essex Hydro
Aries Engineering
GZA Environmental
Granite Shore Power (two sites)
Our gratitude to Franklin Waste Water Treatment Plant for their continued support, including covering sample processing costs, and providing a safe and convenient drop-off area. The Department of Health and Human Services Public Health Laboratory do a wonderful job processing our samples with prompt results. Thank you, Chantal McGuire for your sample courier-ing from Franklin to Concord.
Did you know that the Upper Merrimack Monitoring program is staffed and managed 100% by volunteers? This means that throughout the year, volunteers organize and perform activities including water sampling, collecting benthic macroinvertebrates to gauge long-term river health, and work nights in a laboratory to identify those “bugs?” If you want to learn more or get involved, please contact Michele and Steve (see below for contact information).
Volunteers will take the rest of the year off with August 27 being our last day. Watch your email for updates when our 2025 season begins in June.
Please visit our forum at MerrimackRiver.org/forum and the Upper Merrimack Watershed Association site MerrimackRiver.org for further information. Don’t hesitate to contact us at UMMP@MerrimackRiver.org or 603.796.2615 (landline) should you have any questions.
Sincerely,
Michele L Tremblay Stephen C Landry
Program Manager Sampling Supervisor