Sewer and Watermain Rehabilitation Richmond Hill

We compare CCTV findings, break history, material, remaining geometry, alignment, hydraulic capacity, groundwater, loading, connections, and access. Rehabilitation is selected when the host corridor and design can support a dependable renewal. Collapse, severe sag, widespread joint failure, inadequate diameter, or unrecoverable alignment usually directs the work toward targeted or complete replacement.

Yes. CIPP, close-fit lining, spot repair, cement mortar lining, cathodic protection, and other trenchless methods use maintenance holes or planned access pits and avoid continuous trenching. Small excavations can still be required for fittings, collapsed sections, reconnections, valves, liner insertion, sampling, or geometry that rehabilitation equipment cannot pass.

For sewers, we establish flow control with plugs, pumps, monitored discharge piping, and standby capacity sized to the operating risk. For watermains, we install and test an approved temporary potable-water system and coordinate hydrants and critical users before isolation. The specific arrangement follows owner requirements, site demand, and the planned shutdown window.

We record the initial condition, clean and mechanically prepare the reach, then complete a pre-installation inspection that confirms the bore, connections, and measured design conditions. After rehabilitation and connection reinstatement, final CCTV documents the complete asset, verifies an unobstructed bore, records defects, and identifies any item requiring correction before acceptance.

Internal corrosion creates tubercles and deposits that narrow the bore, increase friction, trap sediment, and can affect water appearance. Cleaning removes loose corrosion products and deposits. Where the remaining pipe is suitable, a smooth cement mortar or engineered liner isolates the interior surface and restores a more effective hydraulic passage.

Provide plan and profile drawings, pipe size and material, installation year if known, break and blockage history, CCTV or leak records, valve and maintenance hole data, flow or pressure information, operating restrictions, traffic constraints, and restoration expectations. We use those records to target field verification and define a comparable construction scope.

Yes, when the selected system spans and seals the actual leakage path. Mainline liners, service lateral liners, connection liners, grout, maintenance hole rehabilitation, and localized repairs address different entry points. We inspect the main, connection, and lateral separately because lining the main alone does not automatically seal groundwater entering around an unrehabilitated connection.

Requirements depend on ownership and asset type. Municipal specifications govern construction and acceptance, OPSS provisions cover relevant civil work, Ontario drinking-water rules control potable systems, and Ontario guidance addresses sewer design and separation from watermains. Project drawings and special provisions remain the controlling documents for each installation.

Selection combines defect type, remaining host-pipe strength, diameter, bends, services, hydraulic capacity, groundwater, soil, access, traffic, shutdown tolerance, design life, and testing requirements. CCTV alone can guide sewer work, but pressure systems may also need samples, leakage history, break data, and material assessment.

No. Access pits, service reconnections, valves, hydrants, bends, collapsed sections, structures, launch and receiving points, and tie-ins can still require excavation. Trenchless work reduces continuous open trench where the pipe and site are suitable; it does not remove the need for preparation, bypass, testing, or surface restoration.