Summary of the Organization
The Lewiston-Auburn Water Pollution Control Authority(LAWPCA) was created by an act of the Maine Legislature in 1967 to provide wastewater treatment services to the Cities of Lewiston and Auburn. The plant started operation in 1974 and was one of the first secondary wastewater treatment facilities in the State of Maine.
LAWPCA does not operate the collection system (sewer pipes and pump stations). In Lewiston, this is the responsibility of the Lewiston Sewer Division of Public Works. LAWPCA does, however, work closely with the Public Works Department in the areas of combined sewer overflows, storm water management, solid waste issues, and other environmental matters.
The treatment plant is designed to handle an average daily sewage flow of 14.2 million gallons per day (mgd). The current average daily flow is about 8 mgd, but during wet weather we often treat 20 to 25 million gallons in a given day due to the combined sewers that serve the Twin Cities. In addition to treating waste generated by the homes, businesses, schools, etc. that are connected to the sewer system, LAWPCA also provides septic and holding tank waste treatment services for 26 area communities (including the unsewered portions of Lewiston and Auburn).
Our industrial pretreatment program is a critical part of our mission. This program works with those industries and institutions that, due to their size or the nature of their business, have the potential to negatively affect the treatment process, degrade our effluent, damage the quality of our biosolids (residual treatment plant sludge), or injure workers in the sewer system or at the treatment plant. We are proud of this program and enjoy excellent cooperation and compliance from our significant industrial users. l
LAWPCA also runs a land application program to beneficially use the biosolids produced at the treatment plant. The biosolids are supplied free of charge to area farmers to help maintain fertility and build soli health. This highly successful program began operation in 1987 and is still important to the Authority and to our farmers today.
In 2013, the Authority brought on line the first anaerobic digester to be used to process municipal wastewater solids in Maine for over 30 years. The anaerobic digestion process reduces the volume of solids that require further costly treatment by approximately 40%, reduces biosolids program CO2 emissions by nearly 80%, and generates a methane rich biogas used to produce renewable energy to help power the plant. While the project cost was approximately $15.5 million, no increase in sewer rates was experienced as a result of this project due to several factors: a 20 year State Revolving Loan Fund bond at 1% interest and 5.95% principal forgiveness, a $330,000 grant from Efficiency Maine, $640,000 in annual operational cost savings, sale of renewable energy credits, and our capacity to accept grease and other high strength wastes to generate additional biogas and electricity.
Although we send out two large bills to the City of Lewiston and the Auburn Sewerage District that cover 94% of our capital and operating costs, we are funded by user fees and not the general tax base. Our annual budget is approximately five million dollars. When looked at on a per unit basis, this is still less than 1/10th of one cent per gallon of wastewater received.
Major Issues Facing the Authority
Combined Sewer Overflows: Sewers that convey both storm water and sanitary sewage in the Twin Cities have the capability to deliver upwards of 50 million gallons of diluted wastewater to the plant in a given day. When this happens, a portion of the diluted wastewater must be diverted straight to the Androscoggin River. These overflow events are becoming much less frequent and of a smaller volume each year as both Cites work to separate combined sewers and make other improvements to the system including storage of high flows until peak flows subside at which time the stored wastewater is treated. We are continuing to work with both communities and the DEP to address this issue in a rational, cost effective, and sensible manner.
Asset Management and Equipment Replacement: The treatment plant on Lincoln Street is now over forty years old. While we believe we have done a good job maintaining the buildings and equipment, we face a significant challenge to keep all of our systems functioning efficiently and in good repair. In addition to the need to replace operating equipment, the atmospheres in which we work are often corrosive and dangerous. Even concrete tanks and buildings need maintenance and repair on a more frequent basis than is common to other structures.
Mercury, Dioxin, PFAS and Other Trace Contaminants: We are now measuring PFAS, dioxins and mercury down to parts per trillion. That’s like trying to find one gallon of milk in Sebago Lake! Because the public often does not understand the concepts and/or the lack of risk involved, some people expect us to discharge zero pollutants to the environment. Living in the world today (or at any time in the past), this is simply not realistic. The problem is that as technology advances, zero becomes smaller and smaller!
Cost Effectiveness and Growth: We realize that our mission is to support the Twin Cities and that wastewater treatment is not a primary goal for most people, but is a secondary need or support function. We, at the Water Pollution Control Authority, need to work with our community to provide the best service possible at an affordable rate. Still, we are solving a problem for the people of Lewiston and Auburn. We don’t create wastewater or biosolids, we just try to manage the wastes that society produces as effectively as possible.
Did You Know!
- We are the second largest treatment plant in Maine and considered relatively large on a National scale.
- We host a great number of tours each year from second graders to college students, and we support local schools with environmental education and outreach.
- LAWPCA is recognized as a pioneer in the cost saving practice of design/build procurement of infrastructure.
- LAWPCA is the first large plant in Maine to modernize into computer operation and thereby reduce staffing from 24 hours per day to 10 hours per day.
- Our Pretreatment Program serves as a model to municipal facilities similar to ours all over the Northeast United States.
- We have employees that have served as President, Treasurer and committee chairs of the Maine Water Environment Association (mewea.org), the New England Water Environment Association (newea.org), and the North East Biosolids and Residuals Association (nebiosolids.org).