Manhole I&I in Florida utilities: sources, standards, and fixes

Florida systems face chronic inflow and infiltration (I&I) through manholes due to high groundwater tables, tidal influence, sandy soils, and intense storm events. Hinterland Group stops manhole-driven I&I with trenchless, standards-based methods that minimize disruption while restoring structural integrity and watertightness for decades. See our integrated Repair and Replacement services for related lift station, bypass, and coatings capabilities.

Who this guidance is for

• Florida municipal engineers, utility managers, and public works directors

• Basin-level I/I programs seeking fast reduction without open-cut replacement

• Owners pursuing trenchless, spec-driven rehabilitations aligned with ASTM standards

Our approach to stopping manhole I&I

Hinterland deploys in-house crews and equipment across the Southeast to execute a three-pillar manhole program: 1) Structural renewal and corrosion protection

• Calcium-aluminate cementitious coatings (e.g., Refratta process) for high H2S and coastal environments, delivered by our specialized coatings crews. Refer to Repair and Replacement.

• Spray-applied geopolymer (SIPP) rebuilding to restore structural section, benches, and flow channels with rapid return-to-service. See our trenchless portfolio under Services.

2) Watertightness and leak sealing

• Pressure/chemical grout injection at pipe penetrations, lift holes, joints, and cold joints to stop active leaks; emergency leak stoppage supported by our 24/7 program. See Emergency leak stoppage.

• Chimney/frame sealing, frame replacement, lid gaskets, and grade adjustments to prevent inflow during rain events.

3) Programmatic inspection, cleaning, and QA/QC

• Vactor cleaning and high-resolution camera inspections to baseline condition and verify results, performed by certified operators. See Inspection.

• Preventive maintenance plans to preserve watertightness and extend service life. See Maintenance plans.

Standards and specifications

• ASTM F2551: Rehabilitation of Existing Manholes by Polymer Lining. Hinterland aligns manhole coating/lining submittals, surface prep, application thickness, cure, and acceptance criteria to this standard, adapting for calcium‑aluminate and geopolymer systems as specified by the Owner.

• Surface preparation, leak sealing, thickness verification, adhesion, and holiday testing are incorporated per project specifications to ensure durable, watertight performance.

Typical rehabilitation steps

1) Clean and inspect

• Vactor cleaning and debris removal; document defects, infiltration points, and corrosion. See Inspection.

2) Surface preparation

• Hydroblast or abrasive prep to remove laitance and biofilm; profile substrate to spec.

3) Leak stoppage and defect repair

• Chemical grout injection at active leaks; rebuild voids; pack joints; repair steps/penetrations as needed. Supported by our emergency leak stoppage services.

4) Structural lining/coating

• Apply either calcium‑aluminate mortar or spray-applied geopolymer to specified thickness, rebuild benches and flow channels, and detail connections to pipes.

5) Finish, cure, and QA

• Finish surfaces, verify thickness, perform holiday/adhesion checks as specified, and produce a final inspection report with photos/video.

Common manhole I&I sources and fixes

I&I source	Preferred trenchless fix	Notes
Cone/joint leaks	Chemical grout, sectional rebuild, coating	Stop active leaks before coating for long-term watertightness.
Chimney/frame inflow	Chimney seals, frame/lid replacement, gaskets, grade adjustment	Critical during wet weather to prevent direct inflow.
Pipe penetrations	Injection grouting, flexible boots, coating detail	Address annular gaps and deteriorated seals.
Barrel cracks/cold joints	Geopolymer or calcium‑aluminate structural lining	Restores section and provides corrosion protection.
Bench/channel defects	Geopolymer rebuild with smooth hydraulic finish	Improves hydraulics and reduces debris deposition.

Case examples and measurable outcomes

• Palm Beach County continuing contract (Work Order No. 1): scope included rehabilitation of approximately 19,500 LF of wastewater gravity lines, 9,300 LF of laterals, and 63 wastewater manholes—demonstrating basin-scale coordination of pipe and manhole rehabilitation under one program. (Company case documentation)

• Emergency flooding response, West Palm Beach: rapid manufacture and installation of a large-diameter CIPP liner to protect thousands of residents; showcases Hinterland’s vertically integrated, rapid-mobilization model that complements manhole I&I work during storm seasons. See related storm/flood response capabilities under Emergency services.

• Regional storm readiness: Following major events (e.g., Hurricane Helene), our trenchless teams restore watertightness and capacity with coating, lining, bypass pumping, and rapid assessments across FL, GA, SC, and NC. See Hurricane recovery services.

How results are verified

• Pre/post wet- and dry-weather flow monitoring, CCTV/sonar manhole inspections, and defect closure accounting at the asset level, rolled up to basin KPIs. Owners typically track reduction in surcharge events, SSOs, and treatment plant wet-weather inflow hours after manhole rehab.

Why Florida municipalities choose Hinterland

• All trenchless technologies performed in-house (CIPP, geopolymer spincast, sliplining, pipe bursting, coatings), enabling objective method selection and single-source accountability. See Services.

• Emergency readiness: 24/7 response, 15‑minute callback, and rapid mobilization across the Southeast, supported by our equipment fleet and wetout capability. See Markets we serve.

• Safety-first execution with an OSHA-certified safety program and consistently low EMR. See About.

Get started

• See our integrated Repair and Replacement page for coatings/coating specs, bypass pumping, electrical, and lift station tie-ins that often accompany manhole I&I programs.

• Coordinate a basin walkdown and inspection plan via Inspection and enroll the assets into Maintenance for long-term performance.