• Obtain sewer records and check for both foul and surface water drainage.
• Use CAT and Genny scanning combined with trial holes to locate sewers.
• Hand dig within 500mm of a known sewer to avoid mechanical damage.
• Monitor for hydrogen sulphide gas when opening manholes or working near sewers.
• Wear appropriate PPE including gloves and face protection near live sewers.
• Obtain approval from the sewerage undertaker before making new connections.
• Cover open manholes and excavations to prevent people and debris falling in.
• Wash hands thoroughly after any contact with sewage or sewer infrastructure.
• Report any accidental sewer damage immediately to the sewerage undertaker.
• Vaccinate at-risk workers against hepatitis A and tetanus as recommended.

• DON'T use mechanical excavation within 500mm of a known sewer position.
• DON'T open sewer manholes without checking for hazardous gas first.
• DON'T enter a live sewer or manhole without confined space entry procedures.
• DON'T assume sewer record drawings are accurate; always verify on site.
• DON'T discharge construction water or chemicals into the sewer without consent.
• DON'T touch your face, eat, or drink after contact with sewage-contaminated material.
• DON'T connect to a public sewer without the sewerage undertaker's written approval.
• DON'T leave excavations near sewers unsupported; ground movement can fracture pipes.
• DON'T ignore unusual smells during excavation; they may indicate a damaged sewer.
• DON'T dispose of contaminated soil or water without proper waste classification.

See also: Safe Digging Practices (HSG47) | CAT and Genny Safe Use