Excrement in Howard County streams and rivers isn't just a problem after a deluge like we had July 30. Water testing this summer by the Chesapeake Bay Foundation found extremely unhealthy bacteria levels in several streams after typical summer thunderstorms. Some of those test sites were swimming holes.
The tests were commissioned by CBF, and conducted by Hood College in Frederick. The partnership tested Columbia lakes in the summer of 2015, finding modestly elevated bacteria levels. This summer, tests were focused on streams feeding the Patapsco River.
People may think waste in our water is only a problem occasionally when sewer lines break in heavy storms, such as the leak that occurred after the July 30 floods, or a problem isolated to big cities such as Baltimore. Not so. CBF tested six Howard streams and rivers after rain storms of as little as a half inch or rain. CBF also tested several times during dry conditions.
The results were troubling. Most sites had unsafe readings even during dry weather, but those readings spiked after ordinary summer storms. Readings at the Cascade Falls swimming hole in Patapsco Valley State Park were up to 300 times above safety limits after a one-inch storm on July 5.
Levels at another popular swimming area on the Patapsco River near Henryton were up to 450 times too high after a 1.5-inch rain a few days before the tragic July 30 storm.
Scientists say water with such high amounts of fecal matter poses health risks to swimmers and others, who can get stomach and intestinal illnesses.
And unfortunately, these high readings at swimming holes weren't atypical. We also found extremely elevated bacteria levels in a small stream running through a residential neighborhood in Elkridge, at the Sucker Branch running past prayer stations at Our Lady's Center in Ellicott City, and at the Plumtree Branch at Dunloggin Middle School, among other sites.
CBF also conducted tests in four other Maryland counties, and in Baltimore City. Additional sites also were tested in Virginia and Pennsylvania. A map of the Howard and other sites can be found at www.cbf.org.
What does all this mean? It means Howard County continues to have a problem with polluted runoff. That's the term we use for water that runs off the land during storms, and picks up all types of contaminants, including possible human and animal waste from leaking sewer or septic systems, pet or livestock waste, and other pollution.
Many of Howard County's local waters, including the Middle Patuxent River, the Upper Patuxent, the Little Patuxent and the Patapsco River Lower North Branch, are considered "impaired" by the Maryland Department of the Environment. Polluted runoff is a major culprit in this problem.
The good news is Howard County leaders stayed strong and retained the county's stormwater fee. Sometimes derided as the "rain tax," this funding source is used to upgrade the county's neglected stormwater system. That work is now underway.
The risks of flooding also will decrease around the county as this work is completed, a major benefit in addition to water quality improvements.
These sorts of upgrades to the county's drainage system take years to undertake, and residents should be patient. But the tests this summer underscore the urgent need for the work.
While we wait, families might heed the rule-of-thumb guidance of MDE: wait 48 hours after a significant rain storm to swim or recreate in any natural waters of Maryland. That unfortunate directive is necessary because polluted runoff remains a major problem for much of the state.
At least Howard County has dedicated significant funds to reduce that pollution.
Alison Prost is Maryland executive director of the Chesapeake Bay Foundation.