Stormwater BMP Installation, Maintenance, and Inspection Services in Maryland
Maryland operates one of the most stringent stormwater regulatory frameworks in the country, driven by Chesapeake Bay Total Maximum Daily Load (TMDL) obligations that require measurable, documented pollutant load reductions from all developed land in the watershed. The Maryland Department of the Environment (MDE) administers the state’s stormwater management program under COMAR 26.17.02, with specific requirements for BMP maintenance documentation, MS4 permit compliance, and impervious area restoration. A 2025 update to Maryland’s stormwater standards combined Environmental Site Design (ESD) with structural stormwater systems, creating new design and maintenance obligations for property owners and developers. Exact Stormwater Management provides certified stormwater BMP installation, maintenance, and inspection services across Maryland, supporting property managers, HOAs, commercial developers, and MS4 permittees working to meet MDE’s compliance requirements.
Maryland Stormwater Regulatory Context
Maryland’s stormwater program is administered by MDE under COMAR 26.17.02 and stands out as among the most demanding in the nation. MS4 permittees are required to restore 20 percent of untreated impervious acres over each permit term, a benchmark that drives significant demand for BMP installation and retrofit work. In 2025, Maryland updated its stormwater management standards to combine Environmental Site Design (ESD) with structural stormwater practices, moving away from an ESD-only approach and increasing compliance costs for new development. Maintenance plans must address mowing, plant health, debris accumulation, sedimentation, erosion, dewatering, and overall BMP function. MDE reviews maintenance records as part of MS4 permit compliance oversight, making thorough documentation essential. Chesapeake Bay TMDL obligations apply additional pressure: every untreated impervious acre represents a phosphorus and nitrogen loading liability that MS4 permittees are required to address through measurable restoration activities. Exact provides the installation, maintenance, and inspection services that Maryland property owners and permittees need to meet these obligations.
Need a certified stormwater inspection or maintenance plan in Maryland? Call (804) 302-5151 or contact us to request a quote.
Who We Serve in Maryland
Exact serves property managers, HOAs, commercial property owners, general contractors, and MS4 permittees across Maryland. Our clients include commercial office parks managing bioretention cells and underground detention systems, HOA communities responsible for shared stormwater infrastructure, municipalities with TMDL impervious restoration obligations, and developers working under the 2025 updated stormwater management standards. Clients on the Eastern Shore and throughout the Chesapeake Bay watershed will find our inspection and maintenance documentation tailored to MDE’s specific reporting expectations.
Frequently Asked Questions: Maryland Stormwater BMP ServicesWhat are Maryland’s stormwater BMP maintenance requirements
What are Maryland's stormwater BMP maintenance requirements?
Maryland requires that stormwater BMP maintenance plans address a comprehensive set of activities including mowing, plant health monitoring, debris removal, sedimentation management, erosion control, dewatering, and structural inspection. The Maryland Department of the Environment (MDE) administers these requirements under COMAR 26.17.02 and reviews maintenance records during MS4 permit compliance audits. The 2025 update to Maryland’s stormwater standards expanded the structural BMP requirements applicable to new development, increasing the scope of maintenance obligations for newly installed systems.
How does MDE regulate stormwater BMPs in Maryland?
MDE administers Maryland’s stormwater program under COMAR 26.17.02 and enforces compliance through the MS4 permit system. MS4 permittees must restore 20 percent of untreated impervious acres per permit term and document maintenance activities for all stormwater BMPs. MDE reviews these records as part of permit compliance oversight. The Chesapeake Bay TMDL framework adds a second layer of accountability, requiring demonstrable phosphorus and nitrogen load reductions from all impervious area in the watershed.
Who can inspect stormwater BMPs in Maryland?
Maryland requires BMP inspections to be performed by qualified professionals, typically licensed engineers or other credentialed individuals as specified in the BMP maintenance agreement and local MS4 program requirements. Exact Stormwater Management provides stormwater inspection services across Maryland, producing written reports structured to satisfy MDE documentation standards and support MS4 permit compliance submissions. Call (804) 302-5151 to request an inspection.
What is the 2025 update to Maryland's stormwater management standards?
Maryland’s 2025 stormwater update changed the design standard from a purely Environmental Site Design (ESD) approach to a combined ESD-plus-structural framework. New development projects must now incorporate structural stormwater systems alongside ESD practices, which increases the technical requirements for site design and raises the long-term maintenance obligations for property owners. This change is also driving retrofit demand as existing sites work to meet the updated standards.
What stormwater services does Exact Stormwater provide in Maryland?
Exact Stormwater Management provides stormwater BMP installation, certified inspection, annual maintenance programs, erosion control, geomembrane liner installation, permeable pavement systems, pond management through our Aquatics Group, and green infrastructure including bioswales and rain gardens throughout Maryland. Our services are designed to align with MDE requirements under COMAR 26.17.02 and the Chesapeake Bay TMDL compliance framework. Contact us at (804) 302-5151 to discuss your stormwater compliance needs.
Corey Simonpietri
804-627-2942
corey@exactstorm.com
SPECIALTY INSTALLATIONS
• Geomembrane / Liner
• Underground Detention
• Permeable Pavement
• Green Infrastructure
• Bioretention
Lovely Ivey
571-591-5991
lovely@exactstorm.com
INSPECTION & MAINTENANCE OF STORMWATER FACILITIES
• Ponds
• Underground Detention
• Stormwater Filters & Separators
• Bioretention
core areas:
INSPECTION & MAINTENANCE: Stormwater PONDS, Detention Ponds, Wet Ponds
Stormwater ponds can be an effective and attractive method of managing water quality and flow. They require regular maintenance to remove sediment, keep inlets and outlets clear and free of debris, and properly maintain vegetation. Our Aquatics Division can restore the functionality of your pond and develop a routine maintenance program to protect your investment and keep your site beautiful.
contact:
Lovely Ivey
571-591-5991
lovely@exactstorm.com
INSPECTION & MAINTENANCE: BIORETENTION
All rain gardens, including the high-flow FocalPoint, StormGarden, and BioPod biofilter systems, require annual maintenance to ensure optimum performance. Annual maintenance guarantees that these systems are allowing for the high flow rates and maximum pollutant extraction that they were designed to accommodate.contact:
contact:
Lovely Ivey
571-591-5991
lovely@exactstorm.com
INSPECTION & MAINTENANCE: Sand/Cartridge Filters, Hydrodynamic Separators
We maintain all types of manufactured treatment devices (MTD’s) such as sand filters, cartridge filters like StormFilter, Bayfilter, Perk filter, Jellyfish filter, Modular Wetlands, and many others. We have industrial vacuums that remove sediment from these filters as well as hydrodynamic separators such as Hydroguard, Stormceptor, Contech CDS, Baysaver, First Defense, Aqua-Swirl, Downstream Defender, Vortechs, and others.
contact:
Lovely Ivey
571-591-5991
lovely@exactstorm.com
With millions of cubic feet of underground detention installed, Exact Stormwater Management is your go-to partner to ensure proper installation of your detention system. We make sure the system is installed correctly, and can help navigate around common pitfalls. We install every system out there, including arched chambers (ADS’ StormTech and Cultec’s Recharger), modular box systems (Ferguons’s R-Tank, Brentwood’s StormTank, and ACO’s StormBrixx), and concrete vaults (StormTrap and StormCapture).
Underground Detention - More Info
contact:
Corey Simonpietri
804-627-2942
corey@exactstorm.com
INSTALLATION: Bioretention Facility, Biofilter, Dry Swale
Bioretention systems, biofilters, rain gardens, dry swales, compost amended grass swales, and many other variations of a semi-natural stormwater filter all serve to clean stormwater before it enters our streams. We specialize in proper installation of these systems - the right materials in the right arrangement at the right time - to make sure the system works as designed.
contact:
Corey Simonpietri
804-627-2942
corey@exactstorm.com
INSTALLATION: GREEN INFRASTRUCTURE
Green Infrastructure refers to a strategic approach that utilizes natural processes and systems to manage stormwater, enhance urban environments, and improve overall ecosystem health. This method emphasizes the preservation and restoration of natural landscapes while integrating them into urban design. Interventions such as rain gardens, permeable pavement, and bioswales work collectively to absorb, infiltrate, and filter stormwater runoff, reducing flooding risks and pollutant discharge into waterways.
contact:
Corey Simonpietri
804-627-2942
corey@exactstorm.com
We install many types of impermeable liners in the Southeast. Liners are typically 30 mil PVC, HDPE, LDPE, RPP, RPE, XR-5, and many other types of liner for the best fit for your application. With personnel in the liner business since 1992, we are the go-to company for liner installations. Underground Detention - More Info
contact:
Corey Simonpietri
804-627-2942
corey@exactstorm.com
INSTALLATION: Permeable Pavement
Permeable pavements are alternative paving surfaces that allow stormwater runoff to filter through voids in the pavement surface into an underlying stone reservoir, where it is temporarily stored and/or infiltrated. We install many types of permeable pavements from grass pavers to concrete brick-type pavers.
Example Installation of Permeable Pavers
contact:
Corey Simonpietri
804-627-2942
corey@exactstorm.com
INSPECTION & MAINTENANCE: Underground Detention
Keep your underground stormwater detention, infiltration, and cistern systems working properly with regular inspections and required maintenance. We perform inspections (including camera inspections) and maintenance on all underground detention systems including: R-Tank, RainTank, StormTech arch chambers, isolator rows, Cultec, pipe detention systems by Contech, ADS, Lane Enterprises, and others.