In May 1866, a Madison newspaper had an article on the demolition of an ornate red brick outhouse built in 1844 on the grounds of the state capitol. The outhouse was being replaced by an in-building water closet, basically similar to today's toilet. However, the water tank had to be filled by hand since there was no pressurized water system in Madison at the time. (A pressurized water system would arrive in Madison in the 1880's during the Sanitary Revolution.) The main problem with the water closet was that for many years there were both private and municipal sanitary pipes that emptied into the Madison lakes. The lakes at the time, were also the source of Madison's drinking water. Population, technology, environmental issues, all worked to evolve wastewater from chamber pots and outhouses, to sewer lines and treatment plants. The Madison Metropolitan Sewerage District (MMSD) was created 95 years ago, on February 8, 1930 by action of then District Court Judge George Kroncke.
The district took over sewage treatment in Madison, and its immediate vicinity. The Nine Springs Treatment Plant was constructed in 1928 by the City of Madison. The plant is on the southside of Madison. Currently, Nine Springs has two outfalls both of which bypass the Madison lakes. The main outfall is to Badfish Creek near the V of Oregon (flows to the Rock River), and a second, put in place in the 1990's, of less than 4 mgd, goes to Badger Mill Creek (flows to the Sugar River) near the C of Verona. The district has received WIDNR approval to close the Badger Mill Creek discharge. The district was formed in 1930, but it took three years for the turnover of the Nine Springs Plant to MMSD. At the time of district formation, Dr Harper of the State Board of Health noted that up to 85% of small treatment plants are not properly operated, and given the number of small plants in existence, there was a recognition that a more effective option was required.
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Current MMSD boundary with pump stations and major force mains and interceptors |
Clean water is a requirement for the survival of the earth and its varied species. Only .5% of the water in the world is available fresh water. Water sources and quality vary by community, by nation and by continent. In the Madison region today water is drawn from municipal wells in lower aquifers often over 1,000 feet deep. Much of the municipally used water in the Madison region is treated at the Nine Springs Plant operated by MMSD. MMSD serves 24 customer communities consisting of over 429,000 persons. The district, serving a land area of 188 square miles, reaches from Morrisonville (unincorporated) and the Village of Dane in the north to lands around Lake Kegonsa in the south. West to east it goes from Verona to Cottage Grove. 18 large regional pump stations are used to help flow get to the Nine Springs treatment plant, with over 145 miles of interceptor pipes. Some pipes used by the district are older than the district, showing that the clay pipes installed 100 years ago are better than some concrete pipes installed in the 1970's. Today, the Nine Springs plant treats on average about 37 million gallons a day, which is actually down from about 40 mgd received in the early 1990's even though the population has increased. This shows that water saving devices have worked, along with tightening up the sanitary sewer lines to avoid inflow and infiltration (known as I/I). A few years ago the district brought on an engineer whose sole purpose is to work on I/I as more can yet be done. The geography of the region, many low lands, makes constructing sewers and keeping them tight from inflow and infiltration difficult.
During and after large storm events flow to the plant dramatically increases. Basement flooding goes to the sanitary system, inflow from manholes, greater infiltration into the sanitary lines and laterals, and even owners who have their sump pumps drain to the sanitary system all contribute. I recall, when I was still working, that the Fitchburg flow to Nine Springs saw a dramatic increase. The source was found to be the basement of an apartment building under construction that hit bedrock and the aquifer, and piped the water to their sanitary line. The peak flow of the plant was over 100 mgd, and that occurred several years ago. Flow not able to processed, due to plant limitations, is stored in the former sludge lagoons and then treated as capacity becomes available. Being open to the elements, of course this also includes a great deal of rain water deposited into the lagoons.
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Commission Meeting, c 2016 |
Much has changed in the world of wastewater treatment over the past 95 years. Today, the plant is a complex operation that involves a myriad of electrical systems, pipes, valves, tanks, filtration and resource recovery (struvite being one example) and utilizes many of the most recent advances in waste water technology. Yet, it depends on some tried and true methods of operation, such as control of varied bacteria and microorganisms in the treatment plant process. In a sense its combination of tried and true methods (bacteria and microorganisms), with newer technologies is meant to provide the best efficiency and more importantly cleaner water to the receiving streams. Wastewater is 99% water, but yet the treatment of that other 1% is critical to human health. On the Nine Springs plant grounds there are underground pipes that no one really seems to know where they are from or where they go, perhaps until one springs a leak.
In 1986 the district moved to Ultraviolet light disinfection, and at that time it was the largest UV disinfection system in the world. By MMSD sponsored research at UW Madison, the district pioneered the use of UV disinfection. A new UV system was installed in 2021 which uses fewer and mor efficient light bulbs (LED). The greater efficiency allows the system to be more easily maintained. This system, and the pioneering work of MMSD, are a few of the reasons why the WIDNR instituted a three month extension to the district's disinfection a few years ago, with it now running from March 1 to Nov 30, instead of April 15 to October 15. This, however, makes for a much narrower window for cleaning and maintenance. It is the first treatment plant in the state to have such a long disinfection season. The disinfection mainly handles e-coli removal.
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MMSD 1935 Construction activity |
The district has pioneered other methods, such as using Adaptive Management to help control phosphorus flow from the plant. Instead of doing an over $100 million dollar plant expansion to handle removal of phosphorus the district teams with local municipalities, farmers, and non-profits to remove the pollutant closer to the source, such as farms. It is a complex undertaking, but saves money and builds partnerships. The sewer district continues to lead this collaborative effort among varied governmental units, non-profits, and varied other organizations.
The district also is able to harvest phosphorus out of wastewater that forms with a complex item called struvite that is hard and difficult to remove when allowed to accumulate in pipes or at pump station impellers. The phosphorus is bagged and sold to a company that uses it in a fertilizer product. Interestingly, our neighboring states lack phosphorus requirements for wastewater, making Wisconsin and outlier, but showing the leadership the state often has had on environmental issues.
Everyone can do their part to not only conserve water, but reduce or eliminate your use of materials containing PFAS compounds. PFAS do not come about in the treatment plant process, but are in everyday objects, like dental floss, non-stick cookware, Gore-Tex, stain resistant carpets, and many other common day materials, (not to mention fire fighting foam which has likely contaminated some wells and potable water supplies) which means they make their way into the sanitary sewer system. This poses a very large issue for biosolid handling. Further, limit salt use on walks and drives in the winter, and make sure your water softener is properly tuned and working. There is no such thing as a flushable wipe, except toilet paper, regardless of the marketing. Further make sure you properly dispose of your old or unused medications, and pharmaceuticals, including over the counter medications, at a med drop. Use caution to limit your use of personal care products which may not have their elements removed in the treatment plant process either.
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MMSD Construction activity, undated |
The work of the district is undertaken by 120 employees who work in maintenance, engineering, planning, resource recovery, and business aspects. The district is governed, since 2015, by a nine member commission made up of five appointees of the City of Madison, three by the villages and cities (other than Madison) served by MMSD, and one by the towns which have territory served by MMSD. Prior to October 2015, the Commission was served by a five member commission appointed by the County Executive.
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1935 Construction at MMSD |
I am fortunate, and privileged, to continue to serve on the Commission since being first appointed by then County Executive Phelps in 1992. I was then reappointed by two other county executives, Kathleen Falk and Joe Parisi, and now, since 2015, to one two year and then three consecutive three year terms by the "small" cities and villages served by MMSD. I have served as Commission president since the restructuring in 2015, being reelected every year to the position by the commission. I have served on the commission for over 32 years, or 1/3 of its existence. I have helped hire three executive directors, the last being appointed in December 2024. I have been fortunate to work on the commission with intelligent, dedicated commission members who have a wide breadth of experience. Dedication of commission and staff have allowed my tenure to to seem shorter than it has.
When I started as a commissioner the prevailing attitude was for the district to avoid news and engagement. Today, a more engaged and proactive approach is necessary to meet the water quality demands of the day. Engagement and proactivity brought about Yahara WINS, as one example. The staff has expanded, with staff for communications to get out district messaging, undertake asset management, additional engineering and financial systems. We lacked human resources staff, but that now exists. When hiring the Executive Director who came on board in 2011 we had to rely on staff from Dane County to assist with the hiring process. The maintenance workers used to take breaks and lunch in shop one, eating next to the sink they washed in, and next to the dirty equipment and clothes worn for the work. They may have had extraordinary immune systems. They now have a modern state of the art maintenance facility with dedicated lunch room and showers.
Much has changed in the Madison region since 1866 (159 years ago) when that ornate red brick privy was torn down on the capitol grounds in favor of indoor water closets. Even more, however, has changed over the past 95 years with the treatment plant at Nine Springs, its eleven major additions and other work. In addition, the region and population served are much larger meaning more interceptors. The district may have reached the soft spot with what water saving devices are able to accomplish. Regulations and requirements have changed, new challenges come about, and yet the district has and continues to strive to enhance the public health and safety through efficient and responsible waster water management.
Images from: www.madsewer.org