Report road flooding and blocked highway gullies to the county council's highways team, usually through an online fault reporting form. Include a photograph and the nearest house number or lamp post ID.
For sewage in the road, or several properties in a street backing up at once, ring the water and sewerage company's emergency line — that is a sewer problem and they attend as an emergency.
If in doubt, the water company will tell you within a minute whether the pipe in question is theirs.