It will mean the sewer can capture more rainwater, preventing sewage overflowing into the River Ribble.
Twenty-five police officers are searching woods in Bolton-by-Bowland in the Ribble Valley for his remains.
The Tory MP for Ribble Valley in Lancashire, 55, has been questioned about alleged attacks on two men.
The Ribble Valley MP, who was questioned by police earlier this month, has said the allegations are "completely false".
Mr Evans, MP for Ribble Valley since 1992, was elected one of three Commons deputy speakers three years ago.
Groups including Ribble Estuary Against Fracking and Friends of the Earth made the call at a protest in Preston.
BBC: Lancashire election candidates asked to oppose fracking
The coastguard agency has dealt with 23 incidents involving cockling in Lancashire's Ribble estuary since its cockle beds opened in September.
He said the new sewer system will help clean up the River Ribble and beaches along the Lancashire coastline from Southport to Blackpool.
Managers at the Royal Preston and Chorley and South Ribble Hospitals say they have been admitting about 50 patients a day more than usual.
Ribble Valley MP Nigel Evans, who is from Swansea, says it was hard enough growing up in Wales as a Conservative, "let alone being gay".
The Ribble Valley Conservative Association, which is yet to discuss the situation with Mr Evans, said in a statement it was "shocked" by the arrest.
The rivers provide drinking water to Blackburn and the Ribble Valley.
He was eventually elected for Ribble Valley in 1992, served briefly as the Tories' main spokesman on Wales (in the absence of any Welsh Tory MPs).
She gestures across the Ribble Valley where a fuzzy sun is rising above the hilltops, tinting the land in olive greens, fox-fur oranges and chestnut browns.
Three generations of the Ribble family hurried through a parking lot in suburban Detroit, eager to see the Red Wings practice when the lockout finally ended.
Mr Evans, MP for Ribble Valley since 1992 - who came out as gay in 2010 - was elected as one of three Commons deputy speakers three years ago.
He said last week that he was continuing work for his Ribble Valley constituency - where he has been an MP since 1992 - which had shown him "fantastic support".
"I was getting nervous we weren't going to have hockey this year, " said Reid Ribble, whose dad joined him, his wife and their two young sons to watch the Red Wings skate last Sunday.
It even says that there are huge differences within some regions, pointing out that in north west England, a 38% poverty level among children living in Manchester can be contrasted with a figure of 7% in Ribble Valley.
But the 2005 Ashes-winning hero and veteran of 79 Tests is keen to play alongside brother Chris Flintoff, who opens the batting for Penwortham, which is situated on the other side of the River Ribble from their native Preston.
The Environment Agency has issued an alert for the River Douglas from Parbold to where it merges with the River Ribble including Rufford, Mawdesley, Hesketh and Longton and the Crossens area which includes Ormskirk to Southport including, Banks, Birkdale, Brown Edge, Mere Brow and Scarisbrick.
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