Want To Know If Raw Sewage Gets Dumped In Your Local River? There’s A Bill On Baker’s Desk About It

A MWRA wet weather sewage discharge outfall warning on the Charles River by the outlet of Boston's Muddy River (Robin Lubbock/WBUR)
A MWRA wet weather sewage discharge outfall warning on the Charles River by the outlet of Boston's Muddy River (Robin Lubbock/WBUR)

Among the many bills sitting on Gov. Baker’s desk is one requiring cities and towns to notify residents any time raw sewage ends up in a local river or water body.

As gross — and alarming — as it sounds, sewage dumps actually happen hundreds of times every year in Massachusetts during heavy rain, because of antiquated sewer systems. They release hundreds of millions of gallons of bacteria-laden waste into waterways like the Charles, Mystic and Merrimack Rivers and Boston Harbor, and the problem is expected to worsen as climate change brings heavier and more frequent rainstorms to the region.

The bill, if enacted, would require wastewater operators to send out email or text notifications to local and downstream residents within two hours of discovering a sewage discharge, and updates every eight hours for as long as the problem persists. They will also have to publish information online about how much sewage-laden water was released and put up signage near problem areas.

First introduced in 2013, a bill establishing the notification system has been kicking around Beacon Hill for three legislative sessions. On Tuesday, both the House and Senate voted overwhelmingly to pass it, a first for this bill. On Wednesday it was delivered to Gov. Baker, who now has 10 days to decide whether to sign it.

If enacted, this notification system will represent a “public health victory for Massachusetts residents” because it will allow people “to make informed decisions on recreation and their own health,” says Patrick Herron, executive director of the Mystic River Watershed Association.

Emily Norton, executive director of the Charles River Watershed Association, agrees.

“This bill is really important because people use our rivers. They certainly use the Charles River for boating and recreation, sometimes dogs go into them," Norton says. "People have the right to know if they're putting their health at risk.”

She adds that the need for this bill is especially acute because we know the coronavirus has been detected in wastewater. “If that's in our rivers, people have a right to know.”

Full data about sewage discharges during 2020 is not yet available, but recent data from the Massachusetts Water Resources Authority shows that on Christmas Day, at least 29 million gallons of sewage water was discharged into Boston Harbor, the Mystic River and the Fort Point Channel during a rainstorm that dropped 1.49 inches of water.

In 2018, a particularly bad year for sewage discharges, 770 million gallons of dirty water was released into the Merrimack River.

If you’re wondering how on earth we could still be dumping sewage into rivers here in Massachusetts, the answer is something called a CSO, or “combined sewer overflow.”

In modern sewer systems, wastewater from our sinks and toilets flows through one pipe, while stormwater from the streets flows through another. The wastewater goes to a treatment plant like Deer Island, and the stormwater is released into a river, stream, harbor or other body of water.

But some older systems are “combined,” meaning that wastewater and stormwater travel in the same pipe. Most days, this works just fine, and everything goes to the treatment plant. But in a big rainstorm, the volume of water exceeds pipe capacity and overwhelms the sewer system. Rather than let sewage back up into your house or the streets, a CSO system is designed to discharge into nearby water.

Combined Sewer Overfall outfalls in the Boston area. (Courtesy of MWRA)
Combined Sewer Overfall outfalls in the Boston area. (Courtesy of MWRA)

Combined sewer systems are a vestige of 19th century urban planning, and those existing today are mostly in older urban areas like Boston, Cambridge, Springfield, Lowell, Haverhill and New Bedford. These days,  no one builds CSOs anymore. But they still exist because they're expensive to undo. (For more on the history of CSOs and how they affect public water bodies in Massachusetts, read this story we published in 2019.)

Since we’re stuck with them for the time being, and since climate change is going to make the overflow problem worse by causing more sudden, heavy rainstorms that overwhelm the system, environmental groups and public health advocates say that a public notification system is the least we can do.

“We’re just asking that the public be notified when there’s raw sewage in the river — it’s such a no brainer,” says Julia Blatt, Executive Director of the Massachusetts Rivers Alliance, which advocated hard for this bill. “Who could be against it? It’s a public health hazard to be recreating in sewage.”

But some say it's not so easy. One example: Phil Guerin, director of Worcester's sewer system and president of the Massachusetts Coalition for Water Resources Stewardship, a group representing the municipal water sector.

“The actual notification part, sending an email or making a phone call, is not the problem. It’s knowing whether you’ve had a CSO [event] that is the challenge,” he told WBUR in 2019.

Cambridge's sewage discharge outfall CAM 007 on the Charles River (Robin Lubbock/WBUR)
Cambridge's sewage discharge outfall CAM 007 on the Charles River (Robin Lubbock/WBUR)

Some outfall pipes have real-time monitoring and sophisticated metering systems to measure discharge, and for those systems, a two-hour notification process shouldn’t be a problem, Guerin said. But other systems are more antiquated.

Reached for comment on Wednesday, Guerin said he hadn’t read the full text of the bill on Baker’s desk, but he’s still worried that if passed, it will “put a significant burden on sewer departments and districts,” many of which already face financial challenges.

“Hopefully, as the public receives these notifications on a frequent basis and grows increasingly alarmed and upset, our state and federal legislators will come up with the hundreds of millions of dollars needed to actually fix the problems with antiquated sewer systems,” he adds. “I’m not overly confident that will happen.”

Katharine Lange, policy director at the Massachusetts Rivers Alliance, thinks that some of these concerns are overblown. In the last legislative session, the bill was amended to allow wastewater operators to model overflows in outfalls that are hard to monitor in real-time, she says. Also, sewer operators know the capacity of the system, and many overflows happen in predictable ways, she says.

“The benefits of people knowing [about CSOs] are just enormous,” Lange says. “So there's really not a great argument not to have this in place for public safety — especially in a year when, as we've seen, people are turning to their local open space and the local water bodies in record numbers.”


Headshot of Miriam Wasser

Miriam Wasser Senior Reporter, Climate and Environment
Miriam Wasser is a reporter with WBUR's climate and environment team.



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