As 4,500 athletes prepare to converge on Philadelphia for this weekend’s Philadelphia Insurance Triathlon, all eyes will be on the skies, in hopes that no serious storms hit the area within the 24-48 hour period leading up to the race. First up in the event’s swim-bike-run format is a swim in the Schuylkill River–which, contrary to popular belief, is surprisingly clean.

As of mid-day Monday that is, when Philly RiverCast indicated the Schuylkill’s water quality was Green, or suitable for all activities. Here’s what it’s showing right now:

The problem is, the water quality in our rivers and streams can drastically change when we’re hit by a storm.

Why? When it rains, the dirt, animal waste, and other contaminants that build up on the surface of the ground or pavement are washed off into the streams and rivers. Though there is more water in the streams and rivers during storms, there are more contaminants as well. That’s not only a problem for triathletes, rowers, and anglers, but for the entire ecosystem that’s linked to a watershed’s health.

It’s no wonder we’re so wrapped up in promoting better stormwater management by pushing for Buffer Legislation, working with the Philadelphia Water Department to highlight the City’s Green Infrastructure movement, and continuing to grow our flagship program, StormwaterPA.

Check out these efforts and learn more about the things you can do to prevent water pollution.

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