Plan before Notice of Intent
Develop the plan before submitting your Notice of Intent for coverage.
The Permittee is required to develop the site's SWPPP prior to submitting the NOI.
Hawaii
SWPPP requirements in Hawaii
Hawaii issues its own construction general permit. We have read NPDES General Permit Authorizing Discharges of Storm Water Associated with Construction Activity (HAR Chapter 11-55, Appendix C) and list below the requirements we could cite to it, with the scope limits stated plainly. Screen your own acreage further down.
Who may prepare the plan
No preparer credential foundNo preparer credential was found for Hawaii. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
No preparer credential found in the reviewed sources. Not exhaustively verified; confirm with the state agency and any local ordinance.
No permit section cited. Confirm this with your permitting authority.
Coverage trigger
Worked through at 3 acres
The project disturbs 3 acres, at or above the 1 acre threshold, so it needs permit coverage.
The trigger people miss is the second one. A half acre lot inside a 40 acre subdivision is covered, because the larger common plan of development or sale is what counts, not the lot.
Read these before you act on the answer
- Requirements below are what we have read and cited directly from NPDES General Permit Authorizing Discharges of Storm Water Associated with Construction Activity (HAR Chapter 11-55, Appendix C), not the federal CGP. A category we have not yet transcribed from this permit is omitted here rather than assumed to match EPA's rule.
- Hawaii's permit does NOT differentiate stabilization completion deadlines by acreage (no 'five acres or less' vs 'more than five acres' split exists in the text); instead it applies a single 14-calendar-day completion deadline to all sites, with a 7-day accelerated deadline only for portions of a site discharging to a CWA section 303(d)-listed impaired water (Section 5.2.1.3.2). Accordingly, stabilization.complete.fiveAcresOrLess/moreThanFiveAcres were omitted and replaced with state-specific facts. Hawaii's 'increased inspection frequency' trigger (Section 9.1.3) is based on discharge to a CWA section 303(d) impaired water, not on a discrete 'sensitive waters' or reef/coastal-specific category -- no coral-reef- or coastal-specific inspection-frequency or buffer provision was found anywhere in the permit text, despite Hawaii's many nearshore/reef waters; the mapped inspection.increased.sensitiveWaters fact below is Hawaii's closest analog (impairment-based) and this distinction is noted in its own 'note' field. No 'arid/semi-arid/drought' reduced-inspection provision exists in this permit (Hawaii instead has reductions for stabilized areas and for frozen conditions, carried over from a mainland-oriented template); inspection.reduced.aridSemiAridDrought was omitted as genuinely inapplicable. No numeric effluent limits or benchmarks (e.g., turbidity NTU, pH range) were found in the permit body -- Hawaii relies on narrative compliance with the state water quality standards at HAR 11-54-4 (Sections 5, 6.1, 9.1) rather than fixed numeric benchmarks, so numericLimitsAndBenchmarks is omitted entirely. Hawaii's permit uses the term 'Notice of Cessation' rather than 'Notice of Termination'; deadline.not.submission below is mapped to that provision.
- No preparer credential was found for Hawaii. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
- Basinwise does not perform the physical site inspections the permit requires. Those must be carried out on site by a qualified person.
What the permit requires of a Hawaii site
Worked for a three acre site with the receiving water unconfirmed. Each line says why it attached to this site rather than in general. Check the notes above for the site sizes this permit does not cover.
Filing
Notice of Intent deadline
Submit before commencing construction activities; the exact lead time is not recorded for this id.
Why this applies here: This is the deadline for a new site. A transfer to a new operator or an emergency related project has a different deadline.
The owner or operator shall submit a complete notice of intent no later than thirty days before the proposed starting date of the construction activity or thirty days before the expiration date of the applicable notice of general permit coverage.
Notice of Termination deadline
When all construction activities have ceased, the permittee must submit a completed Notice of Cessation; the department must receive it within 7 calendar days after the end of the month in which activities ceased.
When all construction activities have ceased, the permittee shall submit to the department a completed Notice of Cessation. The department shall receive this information within 7 calendar days after the end of the month.
Inspections
Inspection frequency, option 1
7At least once every 7 calendar days.
Why this applies here: You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes.
At least once every 7 calendar days; or
Inspection frequency, option 2
14Once every 14 calendar days and within 24 hours of a storm event producing 0.25 inches or more of rain in a 24-hour period, or 3.25 inches or more of snow accumulation in a 24-hour period.
Why this applies here: You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes.
Once every 14 calendar days and within 24 hours of the occurrence of a storm event as specified in section 9.1.2.1.1. or section 9.1.2.1.2. ... A storm event that produces 0.25 inches or more of rain within a 24-hour period.
Who may inspect
A person knowledgeable in the principles and practice of erosion and sediment controls and pollution prevention, who possesses the skills to assess conditions at the construction site that could impact storm water quality, and the skills to assess the effectiveness of any storm water controls selected and installed to meet the requirements of this permit.
Why this applies here: This is why Basinwise cannot perform your inspections. The permit requires a trained person physically on the site.
A "qualified person" is a person knowledgeable in the principles and practice of erosion and sediment controls and pollution prevention, who possesses the skills to assess conditions at the construction site that could impact storm water quality, and the skills to assess the effectiveness of any storm water controls selected and installed to meet the requirements of this permit.
Stabilisation
Initiate stabilisation
Initiate immediately whenever earth-disturbing activities have permanently or temporarily ceased on any portion of the site; 'immediately' means as soon as practicable, but no later than the end of the next work day.
Why this applies here: This applies at both land disturbance amounts.
The permittee shall initiate soil stabilization measures immediately whenever earth-disturbing activities have permanently or temporarily ceased on any portion of the site.
Corrective action
Corrective action, minor fix
Initiate immediately after discovering the problem and complete by the close of the next work day, if the problem does not require significant repair/replacement or can be corrected through routine maintenance; extendable to 7 calendar days with documentation of infeasibility.
Initiate work to fix the problem immediately after discovering the problem, and complete such work by the close of the next work day, if the problem does not require significant repair or replacement, or if the problem can be corrected through routine maintenance.
Corrective action, major fix
When installation of a new erosion or sediment control or a significant repair is needed, install and make it operational, or complete the repair, by no later than 7 calendar days from the time of discovery where feasible.
When installation of a new erosion or sediment control or a significant repair is needed, the permittee shall install the new or modified control and make it operational, or complete the repair, by no later than 7 calendar days from the time of discovery where feasible.
Buffers
Natural buffer
An undisturbed natural buffer and sediment controls are required between disturbed portions of the site and any receiving state waters located within 50 feet of the project's earth disturbances, unless an alternative (narrower buffer with double sediment control, or double sediment control alone plus 7-day stabilization if a buffer is infeasible) is used.
The permittee shall provide and maintain an area of undisturbed natural buffer and sediments controls between the disturbed portions of the site and any receiving state waters that are located within 50 feet of the project's earth disturbances.
Records you must keep
Inspection report deadline
48The permittee must complete an inspection report within 48 hours of completing any site inspection.
The permittee must complete an inspection report within 48 hours of completing any site inspection.
Corrective action log entries
Within 24 hours of discovering a triggering condition, document the condition identified, its nature, and the date/time and manner of identification.
Within 24 hours of discovering the occurrence of one of the triggering conditions in section 10.2.1. at the site, the permittee shall document the following information:
Record retention
3Inspection reports must be retained for at least three years from the date the permit coverage expires or is terminated.
Why this applies here: The clock runs from permit expiry or termination, not from when the record was written, so on a multi year project every record stays live for the whole project plus three years.
All inspection reports completed for this section must be retained for at least three years from the date that the permit coverage expires or is terminated.
Screen a Hawaii site now
Your acreage, your receiving water, your answer. Runs in your browser, nothing is transmitted.
What a plan has to cover, under the federal permit
This is EPA's list, from the 2022 Construction General Permit. It does NOT govern in Hawaii, where the state issues its own permit and sets its own contents. It is here as a shape to expect, not as the requirement you will be held to.
General SWPPP requirementPart 7.1Verified
- All operators associated with a construction site under this permit must develop a SWPPP consistent with Part 7 prior to their submittal of the NOI. The SWPPP must be kept up-to-date throughout coverage under this permit. If a SWPPP was prepared under a previous version of this permit, the operator must review and update it before submitting an NOI.
All Site OperatorsPart 7.2.1Verified
- Include a list of all other operators who will be engaged in construction activities at the site, and the areas of the site over which each operator has control.
Stormwater TeamPart 7.2.2Verified
- Identify the personnel (by name and position) on the stormwater team pursuant to Part 6.1, their individual responsibilities, and which members are responsible for conducting inspections. Include verification that each member has received the Part 6.2 training, and documentation that inspection personnel have received the Part 6.3 training (EPA inspector training certificates, or documentation of a current non-EPA program certification plus confirmation the program satisfies the Part 6.3b minimum elements).
Nature of Construction ActivitiesParts 7.2.3a - 7.2.3iVerified
- A description of the nature of your construction activities, including the age or dates of past renovations for structures undergoing demolition
- The size of the property (in acres, or length in miles if a linear construction site)
- The total area expected to be disturbed by the construction activities (to the nearest quarter acre, or nearest quarter mile if a linear construction site)
- A description of any on-site and off-site construction support activity areas covered by this permit
- The maximum area expected to be disturbed at any one time, including on-site and off-site construction support activity areas
- A description and projected schedule for: commencement of construction activities in each portion of the site (clearing and grubbing, mass grading, demolition, site preparation, final grading, and creation of soil and vegetation stockpiles requiring stabilization); temporary or permanent cessation of construction activities in each portion; temporary or final stabilization of exposed areas for each portion; and removal of temporary stormwater controls and construction equipment or vehicles and cessation of construction-related pollutant-generating activities
- A list and description of all pollutant-generating activities on the site, with an inventory of pollutants or pollutant constituents associated with each, taking into account where potential spills and leaks could occur and any known hazardous or toxic substances such as PCBs and asbestos that will be disturbed or removed
- Business days and hours for the project
- If conducting construction activities in response to a public emergency, a description of the cause of the emergency, information substantiating its occurrence (e.g. a State disaster declaration), and a description of the construction necessary to reestablish affected public services
Site MapParts 7.2.4a - 7.2.4kVerified
- Boundaries of the property
- Locations where construction activities will occur, including: locations of earth-disturbing activities (noting any phasing) including demolition; approximate slopes before and after major grading (noting any steep slopes); locations where sediment, soil or other construction materials will be stockpiled; any receiving water crossings; designated points where vehicles will exit onto paved roads; locations of structures and other impervious surfaces upon completion; and locations of on-site and off-site construction support activity areas
- Locations of any receiving waters within the site and all receiving waters within one mile downstream of the site's discharge point(s), identifying whether any are listed as impaired or identified as a Tier 2, Tier 2.5 or Tier 3 water
- Any areas of Federally listed critical habitat within the action area of the site
- Type and extent of pre-construction cover on the site (e.g. vegetative cover, forest, pasture, pavement, structures)
- Drainage patterns of stormwater and authorized non-stormwater before and after major grading activities
- Stormwater and authorized non-stormwater discharge locations, including discharges to storm drain inlets (noting whether the inlet conveys stormwater to a sediment basin, sediment trap or similarly effective control), discharges directly to receiving waters, and locations where turbidity benchmark monitoring will take place
- Locations of all potential pollutant-generating activities identified in Part 7.2.3g
- Designated areas where construction wastes covered by the Part 2.3.3e.ii exception will be stored
- Locations of stormwater controls, including natural buffer areas and any shared controls utilized to comply with this permit
- Locations where polymers, flocculants or other treatment chemicals will be used and stored
Non-Stormwater DischargesPart 7.2.5Verified
- Identify all authorized non-stormwater discharges in Part 1.2.2 that will or may occur.
Procedures for Inspection, Maintenance, and Corrective ActionParts 7.2.7a - 7.2.7eVerified
- The inspection schedule you will follow, based on whether your site is subject to Part 4.2 or Part 4.3, or whether it qualifies for any of the reduced inspection frequencies in Part 4.4
- If conducting inspections under Part 4.2.2, Part 4.3 or Part 4.4.1b, the location of the rain gauge or the address of the weather station you will use to obtain rainfall data
- If reducing your inspection frequency in accordance with Part 4.4.1b, the beginning and ending dates of the seasonally defined arid period for your area or the valid period of drought
- If reducing your inspection frequency in accordance with Part 4.4.3, the beginning and ending dates of frozen conditions on your site
- Any maintenance or inspection checklists or other forms that will be used
Procedures for Turbidity Benchmark Monitoring from Dewatering Discharges (if applicable)Part 7.2.8Verified
- If required to comply with the Part 3.3 turbidity benchmark monitoring requirements, describe the procedures you will follow to collect and evaluate samples, report results to EPA, keep records of monitoring information, and take corrective action when necessary. Include the specific type of turbidity meter you will use and any manuals or manufacturer instructions on how to operate and calibrate it. Describe any coordinating arrangement with other permitted operators on the same site, including which parties are tasked with specific responsibilities. If EPA has approved an alternate turbidity benchmark, include the data and documentation relied on to request it.
Compliance with Other RequirementsParts 7.2.9a - 7.2.9cVerified
- Threatened and Endangered Species Protection: include the documentation required in the Endangered Species Protection section of the NOI in NeT, or the ESA worksheet in Appendix D, supporting your eligibility
- Historic Properties: include the documentation required in Appendix E supporting your eligibility with regard to the protection of historic properties
- Safe Drinking Water Act Underground Injection Control (UIC) requirements: if using infiltration trenches, commercially manufactured pre-cast or pre-built proprietary subsurface detention vaults/chambers/devices designed to capture and infiltrate stormwater, or drywells, seepage pits or improved sinkholes, document any contact with the applicable State agency or EPA Regional Office responsible for underground injection wells. Such controls would generally be considered Class V UIC wells
SWPPP CertificationPart 7.2.10Verified
- Your signatory must sign and date your SWPPP in accordance with Appendix G, Part G.11.
Post-Authorization Additions to the SWPPPParts 7.2.11a - 7.2.11cVerified
- A copy of your NOI submitted to EPA along with any correspondence exchanged between you and EPA related to coverage under this permit
- A copy of the acknowledgment letter you receive from NeT assigning your NPDES ID (i.e. permit tracking number)
- A copy of this permit (an electronic copy easily available to the stormwater team is also acceptable)
Read the permit itself at the source document.
What people ask about SWPPP requirements in Hawaii
What are the SWPPP requirements in Hawaii?
Hawaii issues its own construction general permit, and we have read NPDES General Permit Authorizing Discharges of Storm Water Associated with Construction Activity (HAR Chapter 11-55, Appendix C). The requirements listed on this page, such as inspection frequency, who may inspect, stabilisation, corrective action and record retention, are cited to that permit rather than to EPA's. Anything we have not transcribed is left out instead of assumed to match the federal rule, and the scope note on this page says which sites the permit does not cover. Confirm the current permit and any site-size variant with Hawaii Department of Health (DOH), Clean Water Branch (CWB).
Who may prepare a SWPPP in Hawaii?
No preparer credential was found for Hawaii. On what we have verified, a generated plan can be adopted by the operator without a credentialed signature. Local ordinances can still be stricter than state law.
How often must a Hawaii site be inspected?
The inspection frequency is set by the Hawaii construction general permit, which we have not read. Confirm it with Hawaii Department of Health (DOH), Clean Water Branch (CWB).
The permit makes you keep the record, not just know the answer
Screening is free. Pro generates the site specific plan document and retains the inspection and corrective action log.