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Our Services
We’re all about clean water — it’s at the heart of everything we do. We work to protect, restore, and sustain the natural systems that keep our waterways clear and resilient. Our work is built on one simple belief: healthy water creates healthy ecosystems. From erosion control and invasive species management to environmental permitting and compliance, we tackle the challenges that come with protecting our environment. We proudly partner with nonprofits, school districts, builders and developers, government agencies, power companies, property management companies, HOAs, and other local businesses to create practical, lasting solutions that care for our communities.
Stormwater Management
Fast, reliable, and done right — every time. Our full-service stormwater team keeps systems running, sites compliant, and water clean. When issues arise, we’re the first call — and often the last one you’ll need to make.
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Ecological & Habitat Restoration
Restoring the places nature calls home. From wetlands and rivers to prairies and oak habitats, our restoration team brings degraded ecosystems back to life with care, science, and local expertise.
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Invasive & Noxious Weed Management
Stopping weeds before they take over. Our specialists identify, control, and remove invasive plants — helping all our clients stay compliant and restore the health of their natural spaces.
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Erosion Control Solutions
Keeping soil in place and water clean. We install, maintain, and monitor erosion control systems that protect waterways, prevent contamination, and keep every project in environmental compliance.
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Environmental Permitting & Compliance
Navigating the rules to stay in compliance. We simplify complex permitting and keep you in good standing with every regulatory agency.
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HOA & Community Services
Caring for shared spaces, naturally. From stormwater systems to open green spaces, we help HOAs maintain safe, attractive, and compliant common areas with reliable, affordable service.
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Land Development & Home Builders
One team for every environmental need. ERSM is the one-stop shop for builders and developers — from environmental planning and permitting to erosion control, restoration, and long-term maintenance.
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Who We Are
With over 20 years of experience, ERSM has grown into the Pacific Northwest’s trusted leader in environmental services. We understand the full spectrum of state and local environmental laws — and how to navigate them efficiently and effectively. Our team brings together engineers, scientists, and field professionals who know how to get things done the right way, the first time.
We take pride in being recognized as a top environmental expert in Washington and Oregon, known for our responsiveness, honesty, and hands-on expertise. From stormwater and permitting to restoration and compliance, we’re driven by one mission: to protect clean water and the natural systems that support it — while helping our clients stay compliant, successful, and proud of the work they do.
We take pride in being recognized as a top environmental expert in Washington and Oregon, known for our responsiveness, honesty, and hands-on expertise. From stormwater and permitting to restoration and compliance, we’re driven by one mission: to protect clean water and the natural systems that support it — while helping our clients stay compliant, successful, and proud of the work they do.
Testimonials
“We use ERSM for maintenance of all our stormwater facilities, vaults, mitigation areas and natural open space maintenance. With stormwater regulations increasing and storm facilities becoming more and more complex, we need an expert in the field to keep these facilities operating properly. We count on ERSM for all those needs because of their expertise and their commitment to timely service. We won’t use anyone else.”
Joe Keizur
Principal and Director of Association Management & Field Services, Rolling Rock
Principal and Director of Association Management & Field Services, Rolling Rock
Project Highlights
- Stormwater maintenance
- Facility inspections
- Detention pond maintenance
- Improved stormwater system functionality
- Reduced flood risk
- Maintained compliance with environmental and local regulatory standards
“ERSM is an excellent company to partner with for habitat mitigation work. We rely on them regularly for our projects, and they consistently deliver outstanding results. Their team is friendly, professional, and incredibly experienced, making the entire process smooth and efficient. We appreciate their commitment to quality and their expertise in ensuring our projects meet environmental standards. I highly recommend ERSM to anyone in need of reliable habitat services!”
Nicole Harris
Construction Operations Manager, Ginn Group
Construction Operations Manager, Ginn Group
Project Highlights
- Wetland and riparian habitat mitigation
- Site preparation
- Native planting & habitat enhancement
- Public Education & Protection
- Completed a detailed As-Built Report
- Improved water quality
- Established a thriving native plant community that supports long-term ecological resilience
“We had a situation where we were short staffed and the invasive and noxious weeds were overwhelming. I knew we had to call in help. Aaron and his team were amazing in helping us out of this situation. Not only were they very timely, the documentation including photos were greatly appreciated. I would highly recommend the ERSM team for any of your invasive and noxious weed needs.”
Jessica Beehner
Facilities, Maintenance, & Grounds Supervisor, Washougal School District
Facilities, Maintenance, & Grounds Supervisor, Washougal School District
Project Highlights
- Reduced and controlled populations of invasive and noxious weeds
- Focused control efforts on Tansy Ragwort and Poison Hemlock, both high-priority invasive species
- Minimized re-establishment risk
- Improved overall site health and ecological balance
“I’ve been working with Aaron Gibson for several years on a number of my properties in Clark County, Washington. His company, ERSM, provides exceptional service. Everyone associated with ERSM is knowledgeable and professional. I am especially impressed by how quickly I receive responses for any emails I send. I’ve actually referred ERSM to several of my colleagues and encouraged them to use ERSM. Highly recommended!”
Bob Mulkey
Association Business Manager, AMS
Association Business Manager, AMS
Project Highlights
- Maintained stormwater infrastructure to ensure proper drainage, prevent flooding, and meet local regulatory standards
- Catch Basin Cleaning & Repair
- Ongoing Maintenance & Inspection
- Improved system efficiency
- Reduced risk of localized flooding
- Maintained compliance with stormwater management regulations