Stormwater Maintenance
& Cleaning Services

Stormwater maintenance involves the regular inspection, cleaning and servicing of drainage systems, sumps and catch pits to ensure rainwater can drain effectively. Over time, sediment, silt, leaves and other debris can build up, restricting water flow and increasing the risk of blockages and flooding. Regular maintenance helps protect your property, drainage infrastructure and surrounding waterways.

The frequency of stormwater maintenance depends on the type of system, its location and the amount of sediment and debris it collects. Most stormwater sumps and catch pits benefit from cleaning every 6–12 months, although busy commercial and industrial sites may require more frequent servicing. CST Group can arrange a regular maintenance schedule suited to your site.

Common signs include water pooling around drains, slow drainage after rainfall, overflowing catch pits, unpleasant odours or visible sediment and debris. If your stormwater system is struggling to handle heavy rainfall, it may be time for professional cleaning.

Both are designed to collect and manage stormwater runoff. A catch pit typically collects rainwater from roads, car parks and paved areas, while trapping sediment and debris before water enters the drainage network. A stormwater sump serves a similar purpose by collecting runoff and allowing sediment to settle. Both require regular cleaning to maintain effective drainage.

Professional stormwater cleaning typically involves removing accumulated sediment, sludge, litter and debris from sumps and catch pits using specialised vacuum equipment. Where required, high-pressure water jetting can also be used to clear blockages and clean drainage pipes. CST Group has a range of specialist equipment to handle stormwater cleaning across commercial, industrial and residential properties.

Yes. When stormwater drains, sumps or catch pits become blocked with sediment and debris, rainwater cannot drain efficiently. During heavy rainfall, this can cause water to back up, overflow or pool around buildings, car parks and other areas. Regular stormwater maintenance helps reduce the risk of flooding and costly property damage.

Stormwater maintenance is generally the responsibility of the property owner, body corporate or relevant consent holder, depending on the site and its consent conditions. Some commercial and industrial properties have specific stormwater maintenance requirements. Regular servicing helps property owners meet their obligations and maintain effective drainage systems.

A planned stormwater maintenance programme is recommended for commercial and industrial sites, particularly those with large paved areas, car parks, loading zones or high levels of sediment runoff. Regular cleaning helps prevent blockages, reduce flooding risks and minimise disruption to operations. CST Group can arrange scheduled sump and catch pit cleaning to suit your site’s requirements.

Yes. In addition to stormwater sump and catch pit cleaning, CST Group provides high-pressure water jetting to clear blocked drains and remove accumulated debris from pipework. We also offer CCTV pipe inspections to help identify underground blockages, damage and other drainage issues.

Stormwater runoff can carry sediment, litter, oils and other pollutants into drainage networks and natural waterways. Regular cleaning of sumps and catch pits removes accumulated contaminants before they can be washed further through the system, helping reduce pollution and protect the surrounding environment.

Stormwater maintenance is important for a wide range of properties, including commercial buildings, industrial facilities, warehouses, shopping centres, schools, car parks, construction sites and residential developments. Any property with stormwater sumps, catch pits or drainage infrastructure can benefit from regular cleaning and maintenance.

Yes. CST Group provides professional stormwater sump and catch pit cleaning across Waikato, Bay of Plenty and surrounding areas, including Hamilton, Cambridge, Te Awamutu, Matamata, Tauranga and Rotorua. Whether you require a one-off cleanout or a regular maintenance schedule, our team can help keep your drainage system operating effectively.