Update: New Stormwater Rule Grandfathering Provisions – What You Need to Know

Now that the new stormwater rule is effective, maintaining the exempt or grandfathered status of your existing project under ‘old rule’ criteria is extremely important. Loss of such status will result in the application of new performance criteria beginning next year and could jeopardize a conceptual ERP that underpins the long-term development plan of your master planned community. It is important to understand how the grandfathering provisions work, and NST is getting a lot of questions from its customers and the consulting engineering community. For this reason, we’ve prepared an outline of exemption and grandfathering provisions of the new rule (located in Section 3.1.2 of Applicant’s Handbook, Volume 1). We’ve also included a couple of examples to help you better understand some likely scenarios. 

1. Routine exemptions. The exemptions and permit thresholds listed in Rule 62-330.020(1), FAC, were not affected by the rule changes, so the exemptions for activities like routine custodial maintenance and single-family homes (not part of a larger plan of development) are unaffected. Thus, if your activity was exempt before the new rule, it is still exempt after the rule change.   

2. Grandfathered permits

a. The perpetual operation and maintenance of completed projects will remain subject to the permit that authorized their construction and the rules in effect at that time.

b. New construction of activities under valid, unexpired permits is unaffected by the new rule.    

c. Minor modifications of valid permits can be authorized without triggering the new rule. This includes a 5-year permit extension, permit transfers, and the other listed changes in Rule 62-330.315, FAC.

3. Conceptual permits. Due to their long duration, conceptual permits are handled a little differently. Unexpired conceptual permits remain valid. Subsequent applications for permits to construct and operate future phases can be processed under old rule criteria if those phases are ‘consistent’ with the conceptual permit. We’ve observed that the determination of ‘consistent’ can be somewhat subjective, but in addition to the rule criteria in Rule 62-330.056(7)(a), FAC, we think the determination will boil down to the phrase used in Handbook section 3.1.2(e)3: “does not cause substantially different water resource impacts.” Also, a major modification of an issued construction permit would subject that phase to new performance criteria, which could require modification of the conceptual ERP. As such, all modifications should be carefully considered in light of this risk, and we strongly recommend pre-application meetings with the reviewing agency.

4. “Pre-2024 development submittals.”  This is a term we’re using to describe the exemptions in Handbook sections 3.1.2(f), (g), (h) and (i). These four categories of exempt activities were added by the legislature in the ratification bill (SB7040) and are summarized below. To be eligible for any of these exemptions, your project must have been approved or submitted for approval prior to January 1, 2024.

a. Projects submitted to local governments as part of a site plan or plat approval if the submittal included stormwater plans.  

b. Projects included in a binding EMA.

c. Projects included in a valid DRI (exempt until October 1, 2044).

d. Projects included in an approved PUD (exempt until October 1, 2034).

5. Transportation projects. Transportation projects were grandfathered or otherwise granted extensions of time under old rule criteria. For more information, see the specific provisions of Handbook sections 3.1.2(e)1 and 2 and the second preamble paragraph in section 8.3. 

6. Examples. In the first example, your client has a conceptual ERP with an expiration date in 2040. You have already received individual permits for the first 2 phases of construction. Phase 1 is complete and in the O&M phase. Phase 2 is under construction. You are about to apply for Phase 3, which has been fully designed. You are about to start the design process for Phase 4. Here is the status:

a. Phase 1 will continue to require O&M as specified in the permit for that phase. 

b. Phase 2 can be completed, certified, and transferred to the O&M phase as specified in the permit for that phase. Additionally, Phase 2 will be subject to the new Inspection and Reporting Requirements of Handbook sections 12.5 and 12.6. 

c. Phase 3 can be submitted as planned. However, you will also need to include the O&M cost estimates and plan as required in Handbook sections 12.3 and 12.4 and, depending on the O&M entity, you may also have to include the new form for Financial Capability Certification to demonstrate the financial capability requirements of Handbook section 12.

d. For Phase 4 and all future phases, you will need to ensure that they are consistent with the Conceptual permit (see Section 3, above).

In the second example, you are about to submit a conceptual ERP for a master planned community, and you are trying to figure out when the new performance criteria will be triggered. The effective date of the new criteria in Handbook section 8.3 has been delayed until December 2025 for Individual and General permits only. This means that the conceptual ERP will be subject to the new performance criteria for all phases for which applications are not complete prior to December 28, 2025. This gives engineers and planners time to keep the designs intact for projects already in the pipeline. Your first phase of construction can be submitted with your conceptual ERP application using the old rule criteria. If you’re moving quickly, you could submit other phases for approval prior to the delayed effective date, but phases submitted after that date will be subject to the new performance criteria. This “hybrid grandfathering” approach gives designers time to plan for transition to the new criteria. 

Like many of you, NST is carefully studying the new rule and planning for its full implementation. We hope this information is helpful to you. Be sure to subscribe to our newsletter for more updates, and you are also welcome to reach out to info@nationalstormwater.com with any specific questions. 

Disclaimer: NST is not a law firm and does not provide legal advice or representation. Please consult legal counsel concerning the interpretation and application of statutes, rules, and other laws to your specific projects or circumstances.  

WEBINAR: Nutrient Trading Under the New Stormwater Rule Change

Learn all about the Regional Stormwater Management System (RSMS) and water quality trading under the new stormwater rule with tips and insights from Mark Thomasson, P.E.! Streaming live from Environmental Permitting Summer School in Marco Island…

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WEBINAR: Navigating New Stormwater Rule Changes in Florida

Position yourself at the forefront of the upcoming changes to sustainable stormwater management and compliance in Florida. Learn all about the new stormwater rule and how it will impact future development standards in Florida with tips and insights from Mark Thomasson, P.E.!

Watch Here

UF Water Symposium Recap

We’re proud that Mark Thomasson, P.E. and Jeff Littlejohn, P.E. represented NST at the recent UF Water Institute Symposium on the panel: Continuously Monitored and Adaptive Control (CMAC), AKA “Smart” Ponds, For Multiple Water Resource Benefits In Florida. Mark led a presentation on Innovative Smart Ponds: How Do They Work? and Jeff shared insights on Smart Pond Technology for Improved Water Resource Benefits. The Symposium brought together over 500 attendees from various disciplines and organizations to explore water issues from multiple perspectives.

The presentations examined two potential applications of smart pond technology using stormwater as an alternative water supply. Conventional stormwater ponds are designed and built to hold a predetermined amount of runoff, but these ponds release partially treated stormwater during and immediately after rain events. With large storms, conventional ponds can overflow and flood the surrounding area with untreated stormwater, impacting communities and the environment.

The latest innovation in stormwater technology incorporates live weather forecast data to automatically operate equipment and lower the pond water level before a storm arrives. While the sun is still shining, a smart pond can automatically release treated water into the environment and thereby increase its flood storage capacity and water quality performance.

The improvements to Florida’s water resources from the use of smart ponds are tangible, and they go beyond just the benefits of flood control and water quality. Much of Florida is confronted with other water resource challenges, such as overallocated aquifers, and these challenges are forcing engineers, scientists, and community leaders to seek out alternative sources of water. Stormwater is generated in such significant quantities that, if appropriately managed and treated, it can effectively supplement or even replace groundwater as a source of drinking water or irrigation water supply.

The challenge has been how to cost-effectively manage and treat this water so that it may become beneficially reusable. Conventional approaches have involved extremely large stormwater reservoirs and costly treatment processes to get water of the appropriate quality in the right place and time to be reused. CMAC technology can help lower these barriers to cost-effective stormwater reuse and change the way we think about stormwater.

The ease with which existing stormwater facilities can be retrofitted with CMAC lends itself to innovative project delivery models. For example, stormwater ponds owned by the Florida Department of Transportation are being retrofitted with adaptive controls to generate nutrient removal credits. These credits are then purchased by other entities to meet water quality goals. Because CMAC systems collect real-time continuous data on the weather forecast, precipitation, storage volumes, discharge rates, residence time, and water quality parameters, performance is being documented to assure regulatory compliance.

Stay tuned for future updates as NST engages in thought-provoking discussions, workshops, and networking events. We are eager to see the innovative ideas and collaborations emerging from the gatherings of water industry and engineering professionals.

Introducing CMAC to Engineers Without Borders

Thank you to everyone who joined us for the most recent enlightening presentation on Continuous Monitoring & Adaptive Control (CMAC) technology! On April 8th, 2024, NST and Florida State University’s Engineers Without Borders collaborated to deliver an insightful session led by NST’s Jackson Ledford, P.E.

Jackson described the innovative realm of CMAC technology, which is revolutionizing stormwater management practices. Here are some highlights from the presentation:
• Introduction to CMAC Systems: Attendees gained a comprehensive overview of how technology is changing the landscape of stormwater management.
• Reshaping Pond Maintenance with Technology: Jackson delved into how technological advancements are transforming the maintenance of ponds, offering more efficient and effective solutions to water quality and flood control.
• Case Studies: Attendees had the opportunity to explore case studies comparing conventional ponds to Smart Ponds, providing real-world examples of the benefits of this technology.


Did you miss the event? Don’t worry! Let us know if you are interested in future opportunities to engage with NST in cutting-edge stormwater management and design solutions. Email us at info@nationalstormwater.com for more information.

WEBINAR: New Year, New Rule

Position yourself at the forefront of the upcoming changes to sustainable stormwater management and compliance in Florida.

Florida water expert and former Deputy Secretary of the Florida Department of Environmental Protection Jeff Littlejohn, P.E., hosted this webinar focused on how new stormwater rule provisions for offsite/compensatory treatment may impact you and projects that you support.

Whether you are in engineering, development, public works, transportation or water resources, these webinars will have something for you.

IN THE NEWS: Florida Trend ‘Smart’ Pond

As Category 4 Hurricane Ian approached in late September, a “smart” retention pond on S.R. 45 near Port Tampa Bay captured 175,000 cubic feet of the polluted flow before it hit Tampa Bay. Technology in the pond continuously assesses its contents and rainfall forecasts to initiate an automatic release of partly filtered contents before a storm comes ashore. Operators can also remotely lower the water levels when a storm approaches.

NST TEAM SPOTLIGHT: Meet Capt. John Ferguson, USN-Ret., President & COO

We are very proud of the rich backgrounds and experience brought to the smart stormwater industry by our team at NST.  One team member in particular, NST President and COO Capt. John Ferguson (USN-Retired), was recently appointed to represent the Muscogee Creek Nation at the ship construction steel-cutting ceremony for the future USNS Muscogee Creek Nation at Bollinger Mississippi Shipbuilding in Pascagoula, Miss.

The vessel is the 10th Navajo-class Towing, Salvage and Rescue Ship (T-ATS) and the fifth T-ATS vessel being constructed by Bollinger since acquiring the program in April 2021.  The Navajo-class provides oceangoing tug, salvage, and rescue capabilities to support fleet operations and are tasked with coming to the aid of stricken vessels. Their general mission capabilities include combat salvage, lifting, towing, retraction of grounded vessels, off-ship firefighting, and manned diving operations.

Named for the Muscogee Creek Nation, the ship honors the self-governed Native American tribe located in Okmulgee, Okla.

How Smart Ponds Work

Most Floridians are familiar with a traditional stormwater pond. They are all around us in residential communities, commercial and business districts, airports, seaports, and similar developments. Traditional ponds hold rain and stormwater runoff. However, in large storms, these ponds often overflow and flood the surrounding area with untreated stormwater.

 The latest innovation in stormwater management is to connect a pond to live weather forecast data and use that information to project water levels and, if necessary, automatically lower its water level before a storm arrives. While the sun is still shining, an NST Smart Pond can actively drain itself to increase its flood storage capacity while in constant communication with professional stormwater managers who can oversee its performance and even remotely control the pond. These are exactly the steps that National Stormwater Trust engineers took in advance of Hurricane Ian’s landfall in Southwest Florida.