CII Compliance Calendar
CII Stormwater Permit Deadlines: What Property Owners Need to Know
Separate staged filings from recurring and option-specific obligations.
Stormwater Legal & Compliance Center / Article
The Los Angeles CII permit has several deadlines, not one universal compliance date. Existing dischargers have staged submission milestones. New dischargers face a different schedule tied to the start of an authorized discharge. Recurring reporting and option-specific duties require separate attention.
Order R4-2026-0226 states an effective date of October 31, 2026. A useful compliance calendar starts with the order's timing language and then identifies which provisions apply to the particular site.
The principal milestones for existing dischargers
Section 3.4.1 establishes the following submission schedule for existing dischargers seeking coverage:
| Submission | Timing stated in the order | Planning reference from October 31 2026 |
|---|---|---|
| Complete Notice of Intent and SWPPP | Within 12 months of the effective date | October 2027 |
| Initial laboratory analytical results required by Attachment E section 2.1 | Within 18 months of the effective date | April 2028 |
| Compliance Option Documents | Within 3.5 years of the effective date | April 2030 |
These month references help with planning; they are not a substitute for calculating the exact applicable filing date and checking any later agency action. A business should set earlier internal deadlines so that technical preparation, review, certification, and submission can be completed on time.
New dischargers have a different rule
Section 3.4.2 requires new dischargers applying for coverage to submit the specified Notice of Intent, SWPPP, initial analytical results, and Compliance Option Documents at least 45 days before commencement of the authorized discharge.
A new facility should not assume it receives the same 12-month, 18-month, and 3.5-year periods as an existing discharger. Where pre-discharge sampling or another submission presents a practical question, address it with qualified professionals and the agency before the planned start. Do not substitute a later date based on an informal interpretation.
A document deadline is not permission to ignore other duties
The staged registration schedule does not answer every question about when a particular control, observation, report, or operating duty applies. Review the substantive permit provisions and the selected compliance option together with the submission schedule.
The permit includes reporting and monitoring requirements beyond the initial documents. For example, provisions for the regional-project option address annual reporting through SMARTS by December 15. Other options have their own monitoring and reporting details. A facility should build a calendar from the requirements that actually apply rather than use another company's spreadsheet unchanged.
Plan backward from the work required
Start by confirming coverage and identifying the responsible discharger. Then establish the site information and technical work needed for a defensible SWPPP and initial sampling. Sampling preparation may involve locating representative discharge points, arranging laboratory support, and assigning trained personnel before a qualifying event occurs.
Evaluate the three compliance options early enough to understand feasibility. A regional-project agreement involves negotiations and eligibility. Onsite controls may require engineering, property access, local approvals, and construction. Direct compliance requires an appropriate monitoring strategy and a realistic assessment of the applicable limits.
The person certifying a submission also needs time to review it. A last-minute upload is not a complete process if required authorization, certification, supporting documents, or fees remain unresolved.
Do not assume a permit challenge pauses the schedule
The order is subject to a Petition for Review by the State Water Resources Control Board but that does not necessarily stay its obligations or revise the compliance schedule. A permit challenge and a decision suspending particular obligations are different things.
Before relying on any claimed extension or suspension, review the actual order or other controlling direction and its scope. Continue planning against the operative requirements unless an applicable change has been confirmed.
Keep a calendar that records responsibility
Questions about a regulator’s request should be assessed separately from this planning calendar. Read our guide to environmental agency information requests for related response considerations.
For each obligation, record the source provision, due date, internal preparation date, responsible person, reviewer, and proof of submission. Track unanswered questions separately. Recheck the calendar when ownership changes, a different compliance option is selected, or the agency issues new directions.
For related guidance, read the three CII compliance options and who is responsible for CII compliance. For legal help with the schedule affecting your property, Get A Case Evaluation.
This information is educational and is not a complete compliance calendar. Verify current requirements and exact deadlines for the particular site.
Discuss Your Compliance Schedule
Identify the property, discharger status, and the deadlines you are reviewing. This guide is not a property-specific deadline determination.