Commercial Property & CII Coverage
Los Angeles CII Stormwater Permit Attorney
Coverage, compliance options, and responsibility for qualifying Los Angeles properties.
Stormwater Legal & Compliance Center / Service
The new Los Angeles commercial, industrial, and institutional (CII) stormwater permit affects many businesses and privately owned properties that were not previously covered by an industrial stormwater permit. It can also affect parts of industrial properties that already have coverage under the Industrial General Permit (IGP).
Figuring out whether the CII stormwater permit applies is not always as simple as looking at the property address or counting parking spaces. Site boundaries, impervious areas, drainage patterns, and existing stormwater permit coverage can all matter.
The Law Office of Jennifer F. Novak helps businesses and property owners understand their CII stormwater permit requirements, determine what coverage they need, and evaluate their compliance options. Get A Case Evaluation.
What the Los Angeles CII stormwater permit covers
For regional water-quality background, see our discussion of the Dominguez Channel stormwater incident. That article is separate from this permit-applicability analysis.
The Los Angeles Regional Water Quality Control Board adopted Order R4-2026-0226 on July 23, 2026. The new CII stormwater permit takes effect October 31, 2026.
The permit applies to qualifying privately owned commercial, industrial, and institutional properties in the Dominguez Channel/Los Angeles and Long Beach Inner Harbor Watershed and the Los Cerritos Channel/Alamitos Bay Watershed. Residential properties are not covered by the CII permit.
For properties that do not have coverage under another NPDES stormwater permit, the CII permit generally applies when the property has five or more acres of impervious surface. Impervious surfaces can include rooftops, parking lots, paved storage areas, and other areas where water cannot soak into the ground.
The analysis can be more complicated when a property already has an NPDES permit, a no-exposure certification, or a notice of non-applicability. A property may have areas that are covered by another permit and other areas that fall under the CII permit.
If your business or property is in one of these watersheds and has five or more acres of impervious surface, now is a good time to review the property's boundaries, drainage areas, and existing stormwater coverage.
How we help with CII stormwater permit requirements
Our legal review can help determine whether the CII stormwater permit applies to a property, which areas require coverage, who is responsible as the “Discharger,” and how existing stormwater permits affect the property.
We also help businesses evaluate the three compliance options available under the CII permit. We work with the client's environmental consultants and other technical professionals to connect the legal requirements with the actual conditions at the property.
For property owners and operators, that may mean reviewing ownership, site operations, drainage areas, existing NPDES coverage, and prior permit filings. The goal is to determine whether the property's current stormwater coverage actually addresses the areas that need to be covered.
The CII permit also matters when a property changes hands. When an existing Discharger transfers ownership, the permit requires the seller to submit a Notice of Termination and notify the buyer about the CII permit application and regulatory coverage requirements. The buyer must then apply for coverage as required by the permit.
Three CII stormwater compliance options
The CII stormwater permit gives Dischargers three ways to address its water quality requirements:
Fund a qualifying regional project through an agreement with the Local Watershed Management Group.
Install facility-specific stormwater controls that meet the permit's requirements.
Demonstrate compliance through site-specific monitoring and reporting.
These options involve different costs and responsibilities. Regional project funding requires an agreement and ongoing financial commitments. Facility-specific controls require design, installation, operation, and maintenance. Direct compliance requires monitoring and reporting to show that the facility meets the applicable limits.
The choice is not simply about the initial cost. Businesses should also consider the work required to implement the option, maintain compliance, conduct monitoring, and meet ongoing reporting requirements.
CII stormwater permit deadlines
The October 31, 2026 effective date is important, but it is not the only deadline businesses need to know.
The CII stormwater permit has different requirements and deadlines for existing and new Dischargers. Existing Dischargers must meet deadlines for submitting the Notice of Intent, Stormwater Pollution Prevention Plan, initial analytical results, and documents related to their selected compliance option. New Dischargers have separate requirements that apply before they begin discharging.
Properties that already have coverage under the Industrial General Permit also need to pay attention to how the two permits interact while they move into CII coverage.
For that reason, businesses should identify which CII permit category applies to their property and create a compliance calendar based on the requirements that actually apply to that site.
The CII stormwater permit is new, and determining what it means for a particular property requires looking at the property, its drainage, its existing permits, and its operations—not just the address.
Our CII deadlines guide explains the principal milestones and planning issues.
Frequently asked questions
Does the CII stormwater permit replace an existing stormwater permit?
Not necessarily. The CII permit can apply to property that already has coverage under another NPDES stormwater permit, including situations where only part of the property is covered. In some cases, an existing individual NPDES permit may eliminate the need for separate CII coverage.
Property owners should review which parts of the site are covered by each permit before changing or terminating existing coverage. CII coverage does not automatically cancel another permit or eliminate the obligations that apply to the portions of the property covered by that permit.
Can a tenant handle CII stormwater permit compliance for the owner?
Yes, in some circumstances. The CII permit defines the “Discharger” as the owner or operator who has the authority and operational control needed to comply with the permit. The permit generally identifies the lessee as the operator. The lease can help establish who has responsibility for operating the property and complying with the permit. But the CII permit controls who must obtain coverage and meet its requirements. If a parcel has multiple lessees, the property owner serves as the Discharger.
Owners and tenants should review the lease, property operations, and existing stormwater coverage together before deciding who will handle CII permit compliance.
Should we choose a compliance option before seeking advice?
It is helpful to obtain preliminary technical information, but a legal review before signing a funding agreement or committing to substantial capital work can identify responsibility, access, and contractual issues that affect the choice.
Discuss your property or facility
Bring the property address, site plan, existing permit records, relevant leases, and any Water Board correspondence to an initial discussion. Get A Case Evaluation to discuss the legal issues affecting your site.
This information is educational and is not legal advice. Permit status and requirements should be checked for the date and circumstances of a particular decision.
Discuss Your CII Permit Questions
Tell us about the property, existing permit coverage, and the owner or operator involved. Please identify any pending deadline.