Pollution Prevention

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Respecting every drop

When water goes down the drain, it doesn’t just go away. Instead, it travels through the sewer system to the District’s Nine Springs Wastewater Treatment Plant, where it is cleaned before being returned to the environment as safe, fishable and swimmable water. While we do remove many pollutants at the plant, some are costly and challenging to take out. Fortunately, pollution prevention can help.

Through education, outreach and innovative program design, our Pollution Prevention team works diligently to keep pollutants such as chloride, mercury, pharmaceuticals and others from reaching the plant in the first place. By keeping these items out of our wastewater, we can help protect clean water while keeping sewer bills low.

What you can do

Your everyday actions to keep pollutants out of the drain help to protect our water. Learn more about specific pollutants that the District is working to reduce and how you can help.

Salt Pile


The treatment plant can’t remove dissolved salt, or chloride, from wastewater. Learn what you can do to reduce your salt use.



Mercury is highly toxic, and we need everyone’s help to keep it out of water and wastewater.

flushing wipe down toilet


The only things that should be flushed down the toilet are the 3 Ps: pee, poop and (toilet) paper. Everything else is a nonflushable.

Pharma Waste

Pharmaceutical waste

There is a place for old, unused or expired prescription and over-the-counter medications, and it’s not the sewer system.



Too much phosphorus in our local waters creates smelly, unsightly algae growth. Learn what the District is doing to reduce phosphorus pollution.

Hands Cooking


Learn more about what the District is doing to address PFAS in the wastewater cycle.