My husband has been in hospital with campylobacter twice he works with sewage is he at risk?

Sewage pathogens: Raw sewage contains multiple bacteria, viruses, and parasites which can lead to infection to exposed individuals. People who work with raw sewage should be provided with personal protection gear to help prevent them from becoming sick.

It is a gut germ: This is a germ that can pass in intestinal waste. His job places him at risk of contamination.He needs to review his personal hygiene practices on the job and be aware of the risk of contamination. If he looks at any exposure as if it were a fatal HIV or Ebola risk he might pay more attention to detail.He also needs to use any protective gear available.

Yes, he is: "Fresh sewage sludge contains high numbers of campylobacters". You and your husband should both read this OUTSTANDING article: https://sfamjournals.onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2672.2001.01355.x