Wastewater Treatment Plant

Located at:
33 Kilton Lane
Machias, Maine 04654

Mailing address:
P.O. Box 418
Machias,  ME 04654

Phone: 207-255-3295
Email: wastewater@machiasme.org

Operated by Olver Associates Inc., Environmental Engineers
Annaleis  Hafford oversees the site and there are 3 employees onsite.

  • Charles Croan, Superintendent
  • Thomas Briggs, Mechanic/Assistant Operator
  • Dakota Norton, Assistant Operator


The Town of Machias’ Wastewater Treatment Facility consists of eight miles of sewer collection system piping, one inverted siphon station, two pumping stations and a treatment facility with the capacity to treat an average of 900,000 gallons of wastewater per day.

As we reflect back on the past year, we want to personally thank the residents of the Town for all they have done, not only by supporting wastewater personnel in their jobs, but also by giving us the tools we need to do our job effectively. Through your actions, you have proven your commitment and respect for the environment. We would invite anyone interested in touring the facility to please call us at the Machias Treatment Facility, and we would gladly show you around, as well as explain how the process works.


Process treatment summary:
94,322,000 gallons of wastewater was treated at the facility. Effluent Biochemical Oxygen Demand (BOD) averaged 6.3 mg/l with a removal rate of 98%. Effluent Total Suspended Solids (TSS) levels averaged 7.5 mg/l with a removal rate of 98%. The licensed TSS and BOD monthly average limitations are 30 mg/l with a minimum removal
rate of 85%.

Collection system progress:
A lot of work was completed within the collection system over the past year. A locking manhole cover was installed on Water Street and one of the manholes that was buried at the siphon station was raised above ground level to permit access. Allen’s Environmental flushed and cleaned sewer lines and manholes on Stackpole Road, the entrance to Main Wild and the cross-country line that leads to the siphon station on the East side. Video was also taken of the inside of these lines as they were cleaned to look for possible breaks or separations. The wastewater crew, with the assistance of the fire department, cleaned and flushed the sewer lines and manholes on Water Street, Short Street, Main Street and the West side cross-country line to the siphon. This is very important to prevent sewer back up events.

A sound test was performed to find a suspected leak in the water main on Elm Street that was finding it’s way into a private sewer line and then into the collection system. This leak was found and fixed which in turn lead to a 25% reduction of flow into the siphon station and reductions in Combined Sewer Overflow discharges at this location.

Inspected cross country lines from West Street to Water Street and Cooper Street to the treatment facility. The siphon station was cleaned and the three lines that run under the Machias River were flushed.

Wastewater Treatment Facility:
The wastewater staff spent a lot of time in 2015 completing housekeeping and maintenance to improve the overall appearance of the plant. This work included the ollowing key items:

  •  All three clarifiers were drained and cleaned, removing algae and sludge that had built up  in them. At the same time, the flush arm gaskets were replaced.
  • Both aeration tanks, digester, wasting tank, contact chamber and conditioning tank were  drained and cleaned. Wastewater staff removed around 10 tons of debris and grit out of  these tanks. The wastewater staff was able to clean the diffusers to allow them to supply  air again. Those that would not work, were replaced.
  • The wastewater staff also cleaned and painted the floors on the first floor of the plant and  the basement.
  • A new tank was installed above the conditioning tank with a mixer. This will allow us to
    mix the lime used for ph control with water. This will saturate and activate the lime prior to being introduced into the conditioning tank. It will also alleviate the problem of the lime settling straight to the bottom of the tank and not mixing thoroughly.
  • Staff installed splash guards on aeration tanks to stop sludge from spraying on walls and  walkways.
  • A railing on the contact chamber that had previously been crushed by a tree was replaced  along with an old loose railing on the back loading dock.
  • New and updated safety policies and programs were written.

In closing, we would like to thank the Board of Selectmen, Town Manager, Public Works
Director and the Highway crew for helping to keep the wastewater infrastructure in top
condition. Again, we would also like to thank the taxpayers for their support, because without your help, it would be extremely difficult to keep our Town and the environment the way we all expect it to be.

Respectfully Submitted,
Charles Croan, Superintendent