The stormwater system collects rain that falls on impermeable surfaces—that is, buildings, roads and parking lots that prevent water from being absorbed directly into the ground—in storm drains and catch basins on roadways and parking lots. While this water is not as dirty as wastewater, it can contain significant pollutants such as motor oil, road salt, pet wastes, winter sand and other chemicals.

Many of the pipes in Augusta carry both sewer and stormwater.  These pipes are commonly known as "combined sewers".

Heavy rains can cause combined sewers to overflow into the environment. These events are called Combined Sewer Overflows (CSO) by the Environmental Protection Agency.  Click here to learn more about combined sewer overflows in Maine.

Our long-term goal is to reduce the frequency of combined sewer overflows.  Methods to reduce overflow frequency include storing large amounts of combined sewer during wet weather events or separating combined sewers into both sewer and stormwater pipes to reduce the amount of runoff water going into the combined sewer.

We recently completed a one million gallon storage tank under Mill Park to capture CSO during storm events.  Combining this storage facility with new pipes and pumps has allowed the elimination of combined sewer overflows into Bond Brook.

Customers pay for stormwater based on the size of their property that is impermeable and, for businesses, the number of catch basins they use. Click here for more information about stormwater and catch basin rates.


GAUD charges most residential customers with a single-family home a flat rate for stormwater handling of $8.30 per month. This is one ERU (Equivalent Residential Unitthe runoff impact of a typical single-family residential home’s footprint). Other residential rates are all based on this:

  • Each multi-family unit or mobile home pays for .5 ERU ($4.15) monthly.
  • Each condo unit pays for .75 ERU ($6.23) monthly.


We charge commercial accounts in two ways: based on the number of ERUs for their impermeable property size, plus a monthly fee of $50.89 for each Catch Basin. Catch basins are underground holding tanks where stormwater is collected when it rains.  The visible part of the catch basin is the grate on top of the basin. Below the surface, an outlet pipe carries stormwater from the catch basin to the wastewater treatment plant.

Notice of rate review

In response to issues raised by customers over the years, GAUD has convened a Stormwater Work Group to review our rate structure for catch basins and ERUs.

Click here to learn more.

We will keep our customers informed through communications such as statement stuffers, newsletters and emails. In the meantime, please call or email Brian Tarbuck at (207) 622-3701 to discuss any questions or thoughts you may have.