Aerial view of the Warren, Maine lagoon system. Photo courtesy of Woodard and Curran.

Lagoon Systems In Maine 

Systems In Maine

An Informational Resource for
Operators of Lagoon Systems

Mars Hill Wastewater Lagoon System - Mars Hill  Maine. Photo Courtesy of Wright-Pierce Engineers.
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Warren Sanitary District - Warren, Maine


The Warren Sanitary Districtís 244,200 GPD ultraviolet disinfection wastewater treatment plant in Warren, Maine uses new technologies to operate as cost-effectively and efficiently as possible. The plantís facultative lagoons are designed and operated to combine anaerobic, anoxic, and aerobic biological processes for effective operations and to reduce energy use and sludge production. Baffles and a recycle pump station in the primary lagoon further enhance process efficiency.

The sewage treatment system includes three pump stations and over 10 miles of collection system.

A dissolved air flotation system removes algae prior to disinfection and makes the effluent quality less susceptible to seasonal variations typical in lagoon systems. Woodard & Curran has operated the plant since 1991.

Thus far operations have been very successful.

Designed to take advantage of innovative developments in facultative lagoon and disinfection technology, the facility also blended funding sources to create low and stable user charges for users within the Warren Sewer District.

The use of the latest ultraviolet disinfection technology in the disinfection system was chosen due to advantages in the areas of safety, ease of operation, and the elimination of disinfection by-products and has proven very successful. Ongoing evaluation and monitoring by operations staff generates useful information shared with Maine DEP, other regional treatment plants, and even national journals and associations to expand the body of knowledge surrounding this application of synergistic technologies.


Lagoon Specifications


Lagoons No.1 No. 2 No. 3 No. 4
Volume 5.59 MG 1.58 MG 1.58 MG 0.61 MG
Lagoon Size 500' x 145' x 18' 230' x 125' x 18' 230' x 125' x 18' 150' x 80' x 12'
Lagoon Acreage 1.66 acres 0.66 acres 0.66 acres 0.27 acres
Aeration Surface Aspirating Surface Aspirating Surface Aspirating Surface Aspirating

Total lagoon acreage is 3.25 or 141,570 square feet. Aerator manufacturer is Aeration Industries, model is the Aeromix Tornado. Design Data as follows: 360 mg/l (BOD) 370 mg/l (TSS)


System Information


Design Flow 0.2442 MGD
Actual Flow 0.050 MGD
Discharge To St. George River
Year Built 1992
Design Engineers Woodard and Curran
Septage Received No
Collector System 6 miles of gravity sewer, 4.5 miles of force main, 
120 manholes, 6 pump stations
Staff Size 2 Full Time, others as needed.
Number of Users 309 people
Billing Software M.Y.O.B. (Macintosh)

Dissolved air filtration, ultraviolet disinfection, effluent storage, partial seasonal storage lagoon.

Aerated Lagoons - Guilford, Maine

Operator Name Michael Courtenay, Plant Manager
Facility Address 442 Cushing Road,
  Warren, Maine 04864
Telephone (207) 273-2047
Fax (207)-273-2047

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