NPS POllution Prevention

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Step 5:  Maintain your septic system

Septic systems need attention.  Inadequate septic systems account for 5-10% of all phosphorus that reaches some lakes.  In addition, toxins, nitrates, nutrients, bacteria and viruses from inadequate septic systems can seep into nearby wells.  This pollution also flows into our streams, harms lakes, and on the coast causes clam flats to be closed.  Here are some useful tips:

• don't use septic additives
• don't pour grease or food down your sink
• pump your system every two to three years
• most importantly, if your septic system was installed before 1974, consider replacing it.

Also, watch for signs of a failing septic system:

• sewer odor
• standing water
• patches of bright green grass growing above your septic tank.

For more information about septic tanks, see

• "In Our Back Yard" articles such as: "Down the septic tank and beyond"
• Water Protection Doesn't Go on Vacation

Go to Step 6

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