The NH Department of Environmental Services recently released its long-awaited draft Great Bay Non-Point Source Nitrogen Study, providing a breakdown of the sources of nitrogen pollution in the estuary, and additional insights on how to improve and protect water quality.

According to the draft study, the Great Bay estuary receives, on average, a total load of 1,225 tons per year of nitrogen pollution.  Of that total load, 390 tons (32 percent) come from sewage treatment plants. The remainder – approximately 900 tons per year – comes from a variety of so-called “non-point” sources: sources of pollution that are less discrete and less concentrated than what many of us may think of as a pipe discharging pollution from a facility. The draft study looked at four major “non-point” inputs of nitrogen pollution – atmospheric deposition, chemical fertilizers, septic systems and animal waste.

The study found that atmospheric deposition accounts for roughly 280 tons of nitrogen pollution annually (23% of the nitrogen load to the estuary). While a large percent of this is from out-of-state sources, such as polluted air from the Midwest, the rest comes from New Hampshire.

We can all help, by taking actions that reduce air pollution – such as by driving less, carpooling, using public transportation, using less electricity, and purchasing power from sources other than PSNH, which continues to operate polluting coal-fired power plants like Portsmouth’s Schiller Station. CLF has joined the empowerNH campaign, which provides information about how you can switch away from PSNH’s dirty, expensive energy and purchase cheaper, cleaner power.

According to the study, chemical fertilizer is another source of nitrogen pollution, adding 30 tons of nitrogen per year, or 18% of the estuary’s total load. Lawns and agricultural areas each contribute about the same amount, while recreational fields, parks and golf courses are only responsible for a small fraction of the total. The message here is clear – agricultural operations need to implement best management practices, and we need to have smaller lawns and use less fertilizer. Learn how you can have a healthy lawn and protect the environment.

Did you also know that more than half of the nitrogen load to the Great Bay estuary comes from human waste?

Human waste from septic systems accounts for 240 tons per year of nitrogen pollution. Add that to the 390 tons per year from sewage treatment plants – the single largest source of nitrogen pollution (and a source that can be easily controlled through sewage treatment upgrades) – and human waste accounts for a whopping 630 tons per year, meaning over half of the total nitrogen load to the estuary comes from human waste.

Animal waste accounts for the remaining 110 tons per year of nitrogen pollution in the estuary, with livestock responsible for most of this total. The rest is from pet waste. While pet waste is not a big part of the problem, reducing the water quality impacts of our pets is something all pet owners can do. Learn about environmentally friendly ways to care for your pet.

According to the study, much of the nitrogen from these non-point sources reaches the estuary through stormwater runoff. This means that in addition to reducing pollution from sewage treatment plants, we have to tackle the difficult challenge of stormwater pollution. Looking forward, it will be essential for communities to adopt “green infrastructure” approaches that reduce runoff, and to promote more compact development patterns as opposed to land-consuming sprawl. Incredibly, as a result of sprawl, impervious surfaces (roads, parking lots and rooftops) in New Hampshire’s coastal watershed increased 120 percent since 1990!

The study also modeled nitrogen loads for individual subwatersheds and towns to identify “hot spots.” These results should be useful in prioritizing efforts to reduce non-point sources of nitrogen and will complement a study being completed by the UNH Water Resources Center to pinpoint many of these hot spots.

Did you find this information useful, interesting, or believe more work needs to be done? Then you can be involved. The Department of Environmental Services is accepting public comments on the draft report until August 16, 2013.

For more information about the Great Bay-Piscataqua Waterkeeper and my work to protect the Great Bay estuary, visit: http://www.clf.org/great-bay-waterkeeper/. You can also follow me on Facebook and Twitter.

Stormwater continues to be a major source of pollution to the Great Bay estuary. When it rains, runoff carries a wide range of pollutants – from dog waste and lawn fertilizers, to gasoline and oil, to heavy metals, nutrients and sediments – that flow into our waters with little or no treatment.

To combat this pollution, the UNH Stormwater Center and other local groups are working with Seacoast communities to implement projects at a neighborhood level to reduce the flow of untreated stormwater reaching the estuary. While many of these projects are small in scope, they demonstrate the value of dealing with stormwater close to home. One of the most interesting approaches is based on a program that was developed in Maine.

In 2009, the Kennebunkport Conservation Commission, in partnership with the University of New England, the Maine Lobstermen’s Association and others, developed the Lawns for Lobsters program. The program’s goal is to educate homeowners on steps they can take to ensure a healthy lawn with minimal impact on the environment. The program was also recently renamed Lawns to Lobsters, giving greater emphasis on the flow of water from our lawns to the ocean.

Other communities are now adopting the program, including one in New Hampshire. New Castle, the only town in the state composed entirely of islands, covers approximately 500 acres and sits at the mouth of the Piscataqua River. With a residential population of slightly more than 1,000, the town’s Conservation Commission is committed to reducing the impacts from non-point sources of pollution and launched the Lawns to Lobsters program last summer.

Residents who want to participate in the program take a pledge to use sound stewardship principles in managing their own property. This includes testing the soil before using a fertilizer, applying the correct amount, and not applying fertilizer if rain is predicted in the next 48 hours. Other measures include keeping the grass at least three inches in length (tall grass needs less water), planting clover as a fertilizer substitute, properly disposing of dog waste, and using herbicides and insecticides sparingly. Homeowners also are asked to consider replacing all or part of their lawn with native plants.

Long term, the town wants to encourage citizens to install rain gardens and vegetative buffers as a way to prevent polluted runoff. In a compact community such as New Castle, all of these steps can add up and help to protect our waterways. You can read more about the New Castle Conservation Commission’s efforts to protect the Great Bay estuary here.

In partnership with the Great Bay Stewards and the NH Department of Environmental Services, we plan to launch a similar program for homeowners next spring. The program will be based on the Department’s Homeowner’s Guide to Stormwater Management. Stay tuned for more information!  In the meantime, there are lots of resources available to homeowners on how to install a rain garden. The University of NH Cooperative Extension Services offer an excellent guide called Landscaping at the Water’s Edge.

As Waterkeeper, I find it encouraging that New Castle is addressing the serious issue of stormwater pollution. We all need to work together to solve the problem. By becoming responsible homeowners, New Castle residents are taking an important first step.

For more information about the Great Bay-Piscataqua Waterkeeper and my work to protect the Great Bay estuary, visit: http://www.clf.org/great-bay-waterkeeper/. You can also follow me on Facebook and Twitter.

We didn’t always have a love affair with our lawns. Until the late 18th century, most rural homeowners had a patch of packed dirt outside the front door or a small garden that contained a mix of flowers, herbs and vegetables. Up until then, lawns were not practical and were seen strictly as a luxury for wealthy landowners who could afford grounds keepers to maintain the grass with hand tools.

That all changed with the invention of the rotary mower and garden hose. Since then, green, weed-free lawns are common today and millions of Americans spend billions of dollars on landscaping companies to cut and maintain their grass. According to a 2000 Gallup survey, over 26 million US households hired a professional landscaping company. That little patch of green has become a big business.

Unfortunately, when homeowners over-fertilize or apply fertilizers incorrectly they are contributing to the nutrients pollution problem facing so many of our waters. The Great Bay estuary is no exception. The total nitrogen load to the estuary has increased significantly in recent years leading to declines in water quality, as evidenced by significant losses of the estuary’s cornerstone habitat – eelgrass. Preventing nitrogen pollution from lawn care is one of the steps needed to restore water quality and the health of the estuary.

Personally, I have never understood the allure of a green lawn. I don’t want to spend my weekends cutting grass or hire someone to do this work. However, if you prefer having a lawn it is important to make it as environmentally friendly as possible. First, consider downsizing your lawn by planting native shrubs and flowers. Most of my yard is a wild field or landscaped with native plants which provides excellent wildlife habitat. My family enjoys watching all the birds that are attracted to the diversity of plants living here.

Many people choose to have low-maintenance lawns which require no fertilizer. This is a great way to have an environmentally friendly lawn that does not impact water quality. For those who choose to use fertilizer, I encourage you to get your soil tested at the NH Cooperative Extension to learn what fertilizer best meets your needs and how best to apply it.

If fertilizer is required, the best strategy is to use an organic (not synthetic), slow-release nitrogen fertilizer. On the back of the bag, slow-release nitrogen is listed as “water insoluble nitrogen.” By using a slow-release type fertilizer, fewer applications are needed and some experts suggest only fertilizing once a year in the fall. Always remember to carefully follow the directions, as applying any kind of fertilizer can have an adverse impact on water quality. You should only use fertilizer with a content of at least 50% water insoluble nitrogen to protect against adding excess nitrogen to the groundwater that could eventually flow into the estuary.

Other tips for maintaining a healthy lawn with less environmental impact include:

Mow High – Taller grass has deeper, healthier roots; 3 inches or higher is recommended;

Leave Grass Clippings Behind – Grass clippings are a free source of nutrients;

Aerate Your Soil – Aeration allows water, air and nutrients to reach the soil more easily;

Fescue Seeds – Use seed mixtures with a high percentage of fescue grasses, which require less watering and mowing.

More free tips on low input lawn care are available from the UNH Cooperative Extension. The Extension also offers an excellent publication called Landscaping At the Water’s Edge, which provides excellent advice on how to create a natural buffer between your lawn and a waterway.

For more information about the Great Bay-Piscataqua Waterkeeper and my work to protect the Great Bay estuary, visit: http://www.clf.org/great-bay-waterkeeper/. You can also follow me on Facebook and Twitter.