What does gray infrastructure maintenance cost?

Maintenance costs depend on the number of structures being serviced, how often they’re maintained, the type and condition of each structure, site location, and access constraints. A single catch basin cleaning is a straightforward line item; a multi-structure annual program involves more variables. Riparia provides itemized quotes after reviewing your site documentation and completing an on-site assessment.

How quickly can service be scheduled?

Straightforward cleaning and inspection jobs can typically be scheduled within one week of approval. More complex scopes—those involving structural repairs, permit requirements, or material sourcing—may take longer depending on the specifics. If you’ve received a notice of violation with a compliance deadline, let us know upfront and we’ll work to accommodate your timeline.

How often does gray stormwater infrastructure need to be maintained?

At minimum, stormwater infrastructure should be inspected annually. Cleaning frequency varies by structure type and site conditions—catch basins should generally be cleaned once per year on average, and high-sediment sites may warrant more frequent service. Specialized treatment structures typically have their own maintenance intervals based on manufacturer recommendations and permit requirements. Additional maintenance items such as grout repair and pipe connection replacement should be addressed as conditions warrant.

Where does Riparia provide gray infrastructure maintenance services?

Riparia services the entire Seattle/Tacoma, Portland, and Oregon metropolitan area. Contact us to confirm coverage for your specific location and to discuss whether service is available outside the metro area for larger or specialized projects.

How do I get started?

Reach out to us with a general description of your infrastructure and what you need—whether it’s a routine annual cleaning, a response to a regulatory notice, or a facility you’ve never had serviced and aren’t sure where to start. We’ll take it from there, walking you through the site visit, quote, and scheduling process so service happens efficiently.

Gray Infrastructure Maintenance

Gray stormwater infrastructure, also known as “hard infrastructure,” is the engineered concrete and metal systems designed to capture, store, treat, and convey stormwater. You can rely on Riparia to deliver routine professional maintenance to keep facilities functional, compliant, and structurally sound.

Schedule a Gray Infrastructure Maintenance Visit

Worker in hard hat and high-visibility vest using a vacuum truck hose to clean a storm drain in a residential street

Engineered & Maintained to Last

Riparia provides comprehensive gray infrastructure maintenance, including vacuum truck services, catch basin cleaning, and confined space entry. Because many of these systems are designed by our engineers at MacKay, we bring an intimate understanding of how they’re built, how they’re intended to perform, and what they need to stay effective.

Shield-shaped emblem showing a rainy landscape with river, pine trees, mountains and orange sunset, labeled "Stormwater Management"

Who This Is For

Property managers at multifamily complexes who need annual catch basin and storm manhole cleaning and inspection to stay compliant with O&M obligations.
HOA association managers maintaining drainage and flood control across a portfolio of clients and looking for a single contractor who understands the requirements involved.
Facilities managers at commercial and institutional properties who need cleaning of filter vaults, oil/water separators, or other specialized treatment structures—or who have received a notice from the City.
Environmental managers at industrial facilities required by their stormwater permit to perform quarterly or annual maintenance with qualified documentation.

What To Expect

When Riparia maintains your gray infrastructure, you receive professional service backed by proper equipment, trained personnel, and thorough documentation. Depending on scope, services may include:

Worker in hard hat and high-vis vest removing debris filters from an open storm drain with suction hose and truck nearby

Cleaning of catch basins, manholes, culverts, filter vaults, and other structures
Inspection for sediment accumulation, debris, and structural condition
Maintenance of filter vaults and treatment devices
Grout repair and structural patching
Inspection, cleaning, and rehabilitation of dry wells and wet wells
Installation of filter socks, inserts, and other components
Clearing blockages in inlets, outlets, and outfalls
Oil/water separator and hydrodynamic separator service
Maintenance and inspection logs documenting all work completed, submitted to you or your regulatory agency as required

How We Work

1. Receive Your Inquiry

Reach out with your project details—routine annual cleaning, a notice of violation, or a facility you need assessed. We respond promptly.
2. Review Documentation

We review as-builts, NOVs, existing maintenance records, and O&M agreements to understand the scope. If a site visit is warranted, we schedule one quickly.
3. On-Site Assessment

Our team visits the site to confirm scope, identify access or safety considerations, and gather the information needed for an accurate proposal.
4. Prepare & Present Quote

We prepare a clear, itemized quote and walk you through scope and fee—no surprises.
5. Schedule & Complete the Work

Work is typically scheduled within one to two weeks of approval. Our crew mobilizes with the appropriate equipment and ensures the site is left clean and in good order.
6. Submit Maintenance & Inspection Log

We submit a detailed log documenting everything performed—ready for your records or regulatory submittal. We can also set your site up on an annual maintenance program for ongoing compliance.

Why Gray Infrastructure Maintenance Matters

Gray stormwater infrastructure accumulates sediment, debris, and pollutants with every storm event—and without regular maintenance, that accumulation compounds quickly. Catch basins fill up, filter cartridges foul, hydrodynamic separators lose their treatment efficiency, and debris builds into blockages. At that point, the system isn’t treating stormwater, it’s just moving it, sending untreated water downstream where it can cause further issues.

View down into a manhole showing murky wastewater, a vertical pipe, and metal ladder rungs along the wall

Preserving Treatment Capacity

Routine cleaning removes accumulated sediment before structures lose their ability to capture and treat stormwater—staying ahead of buildup is far less costly than rehabilitating a degraded system.

Preventing Blockages & Flooding

Debris and sediment accumulation can develop into full blockages that cause stormwater to back up during storm events, resulting in serious property damage and significant liability.

Worker in a hard hat and neon safety vest kneeling by a small forest stream, clearing vegetation with hand tools.

Protecting Downstream Water Quality

When gray infrastructure isn’t maintained, the material it was designed to capture migrates downstream—degrading water quality and potentially reaching lakes, streams, and rivers.

Maintaining Permit Compliance

Many stormwater permits include explicit maintenance and inspection requirements, and failing to meet them can result in notices of violation, fines, and corrective action that cost significantly more than routine maintenance.

Signature Projects

Two workers in safety gear inspecting plans beside an open manhole and a large vacuum truck with extended hose on a hillside road

City of Camas — Filter Vault Maintenance, Municipality

Riparia partnered with the City of Camas to restore treatment performance across multiple stormwater filter vaults throughout the city. The vaults required routine maintenance and component replacement to maintain proper system functionality and treatment capacity. Services included vault cleaning, filter cartridge replacement, and installation of required system components as needed. The project was completed on time and within budget, restoring reliable treatment performance across the City’s filter vault inventory.

Two utility workers in hard hats and high-visibility vests operating a large vacuum truck hose over a storm drain in a parking lot.

JSH Properties — Vancouver Logistics Stormwater Maintenance, Commercial Property Management

JSH Properties engaged Riparia to perform annual catch basin cleaning and inspection at the Vancouver Logistics site. Riparia cleaned over 30 catch basins, submitted a comprehensive inspection report, repaired deteriorated grout in three catch basins and an overflow beehive structure, and installed filter socks throughout the system. Completed on time and within budget.

Frequently Asked Questions

Maintenance costs depend on the number of structures being serviced, how often they’re maintained, the type and condition of each structure, site location, and access constraints. A single catch basin cleaning is a straightforward line item; a multi-structure annual program involves more variables. Riparia provides itemized quotes after reviewing your site documentation and completing an on-site assessment.
Straightforward cleaning and inspection jobs can typically be scheduled within one week of approval. More complex scopes—those involving structural repairs, permit requirements, or material sourcing—may take longer depending on the specifics. If you’ve received a notice of violation with a compliance deadline, let us know upfront and we’ll work to accommodate your timeline.
At minimum, stormwater infrastructure should be inspected annually. Cleaning frequency varies by structure type and site conditions—catch basins should generally be cleaned once per year on average, and high-sediment sites may warrant more frequent service. Specialized treatment structures typically have their own maintenance intervals based on manufacturer recommendations and permit requirements. Additional maintenance items such as grout repair and pipe connection replacement should be addressed as conditions warrant.
Riparia services the entire Seattle/Tacoma, Portland, and Oregon metropolitan area. Contact us to confirm coverage for your specific location and to discuss whether service is available outside the metro area for larger or specialized projects.
Reach out to us with a general description of your infrastructure and what you need—whether it’s a routine annual cleaning, a response to a regulatory notice, or a facility you’ve never had serviced and aren’t sure where to start. We’ll take it from there, walking you through the site visit, quote, and scheduling process so service happens efficiently.

Related Services

Stormwater Repairs & Installation

Structural repair and installation of catch basins, piping, erosion control, flooding areas, pond dredging, sinkholes, and other structural defects.

Read more
Green Infrastructure Maintenance

Specialized maintenance for vegetated stormwater facilities including bioswales, bioretention cells, rain gardens, and detention ponds.

Read more
Vacuum Truck Services & Pipeline Jetting

Hydrovac excavation, industrial cleaning, waste removal, and pipeline jetting services using Riparia’s vacuum truck fleet and equipment.

Read more

Two utility workers in safety vests and hard hats feeding a large corrugated vacuum hose into an open manhole beside a service truck.

Ready To Get Started?

Don’t wait for a Notice of Violation (NOV), flood, or failure to find out your stormwater infrastructure needs attention. Contact Riparia today to schedule an inspection and cleaning—and let’s get your system on a maintenance program that keeps it functional and compliant year-round.

Schedule a Maintenance Visit

Or call us directly: (360) 693-4555