It's the season to be busy around the home with cleaning, painting and gardening high on the list of things to do while the weather is right.
The Greater Wellington Regional Council (GWRC) is reminding people that roadside gutters are only for rain.
There are a number of incidents each summer where council staff are called out because DIYers have tipped paint or other pollutants down stormwater drains, said Naomi Middleton, GWRC's Senior Environmental Protection Officer.
"Stormwater drains include the gully traps for rainwater that runs off your roof and down the spouting as well as the gutters and drains on the streets.
"Whatever goes down these drains passes, largely untreated, into streams, rivers and the sea," Miss Middleton said.