This page is a practical explainer, not an official notice or compliance determination. If you have a property-specific letter, follow its instructions and ask your issuing agency when unsure.
Identify what needs work
Stormwater systems are not interchangeable. A rain garden or planted swale needs a different set of skills than a mechanical treatment filter, vault, underground drain or damaged pipe.
Start with the property’s O&M plan or inspection letter. Portland provides separate public contractor lists for vegetated and structural/mechanical facilities. Its lists are informational and do not certify or recommend companies.
- Vegetated: landscaping, vegetation, invasive plants, sediment and surface erosion.
- Structural/mechanical: vaults, inlets, filters, flow controls and specialized cleaning.
- Repair or alteration: ask about required approvals and permits before changing the drainage design.
Understand maintenance vs. repair
Routine care might mean clearing leaves, managing weeds and removing visible litter where safe. A repair might involve replacing a damaged component, addressing broken pipes or altering the shape or drainage of a facility.
Portland warns that changes and replacement of certain drainage features can require permits. Do not assume a contractor can modify a designed stormwater facility without agency review.
- Ask the contractor to identify the exact facility and problem.
- Request a written scope distinguishing routine cleaning from repair or alteration.
- Confirm permit needs and who will obtain them.
Catch basin cleaning and stormwater vault maintenance
In Portland, catch basins and some underground treatment structures require a different service approach from lawn and garden maintenance. If a notice identifies sediment accumulation, restricted flow, a damaged inlet or a vault problem, ask a structural/mechanical contractor whether it services that exact component.
The public City of Portland list separates structural and mechanical stormwater contractors from vegetated-facility providers. Ask how cleaning waste is managed and how service will be documented for your property’s O&M records.
- Describe the location and type of catch basin, drain, vault or filter.
- Ask whether the provider can inspect and document the specific condition.
- For confined-space or underground work, do not attempt entry yourself.
Bioswale and rain garden maintenance
Bioswales, rain gardens and planted stormwater planters commonly need vegetation care, debris removal and sediment control. A contractor experienced with stormwater landscaping can be better suited than one focused solely on underground pipes and vaults.
Avoid changing the grading or approved vegetation of a stormwater facility without reviewing its O&M plan and agency requirements. Portland publishes separate care information and general maintenance thresholds for planted facilities.
- Identify the facility and approved maintenance plan before work begins.
- Ask for stormwater-specific planting, erosion and inlet-maintenance experience.
- Keep photos and maintenance notes for your records.
Questions to ask before hiring
Our directory organizes providers from Portland’s published resource, but we have not independently verified each company’s qualifications, credentials, availability or current service area.
For a meaningful comparison, ask at least two appropriate businesses for an itemized scope when practical, especially for repairs that involve structural components.
- Do you work on this exact facility or manufacturer’s system?
- Do you serve my property address and timeframe?
- Which licenses, certifications and insurance apply to this work?
- Will you provide inspection findings, photographs and documents needed by the issuing agency?
After the work is done
Keep the contractor’s notes, photos and invoices. If an inspection letter prompted the work, review its instructions for confirmation, proof, re-inspection or contact with the named inspector.
A paid invoice alone does not establish official compliance. Only the responsible agency can confirm whether your particular notice has been satisfied.
- Check that each action item from the letter is addressed.
- Record completed work and retain the documents.
- Contact the inspector when the letter instructs you to report back.
Official sources and forms
- Portland: official maintenance resources and published contractor lists
- Portland: facility care and permit discussion
Requirements may change. Confirm deadlines, eligibility, maintenance and permit details with the responsible agency for your address.
Need help with the physical work?
Understand the requirements first. Then find publicly listed providers by facility type, and verify service area, current qualifications and insurance before hiring.