Proudly serving Chester & Southern Lancaster Counties, PA; New Castle County, DE; Cecil, and Harford Counties, MD

610.274.8252

Get a Quote

Who we are

About Us

PES Team 2025

How it all started

Learn more about how Pierson Environmental Services came to be a full-service excavation and septic service company serving Chester, Delaware, New Castle (DE), Cecil (MD), and Southern Lancaster Counties.

Who we are

Our Story

Pierson Environmental is a full-service, family-owned & operated excavation and septic service company, founded in 1969 and spanning three generations. We routinely provide a complete range of septic and excavating services, proudly serving Chester, Delaware, New Castle (DE), Cecil (MD), and Southern Lancaster Counties.
Get a Quote

What Our Customers Say:

"Mark treats his customer very good and it's very considerate to everybody and a works great with his workers."

Michael R.

"Cleaned our septic system. Did not wait long for an appointment and was friendly and helpful with suggestions."

Nancy B.

"Very pleasant to deal with. Great small business."

Kevin C.

"Mark was extremely helpful and friendly. He’s very knowledgeable and professional. He didn’t push any unnecessary services. I am really appreciative of all his help!"

Penny E.

"Mark is a great guy to speak with. He took the time to explain while on-site with me. Great staff in the office as well, communication is solid!"

John J.

"We've used Pierson's services for at least 5 years for our annual septic cleanouts at home and our shop. Professional, friendly staff. Good prices for service. Highly recommend."

Laura S.

45

Who we are

Our Team

Meet our team of dedicated professionals.
Mark Pierson
Mark Pierson

Mark Pierson

Owner/CEO/President

Years with company: Forever

Personal info: Married to his wife, Lenna since 1986. They have 2 adult children, Heather (married to Sean), and David (married to Monica), and 4 grandchildren: Malcolm, Hope, Marcus and Maverick.

Pets: Has had dogs all his life. Most recent pet is ‘Ranger Dog’ who also served as our office pet!

Favorite activities: Watching TV, playing word games, taking leisurely drives in the country with Lenna.

Part of job that he loves to do: He loves problem solving, meeting new people, explaining how septic systems work to educate our customers, operating equipment… pretty much everything but paperwork!

Favorite food: Alaskan King Crab legs, clams, anything pasta.

Linda Mister
Linda Mister

Linda Mister

Office Manager

Joined the company in: 2018

Personal info: Married to her husband, Ben since 1987. They have 2 grown sons, Benjamin, Joshua (married to Meredith), plus 3 handsome grandsons: Garrison, Brennan and James.

Favorite activities: Spending time with her family, spoiling her grandsons, camping, and working on scrapbooks.

Part of job that she loves to do: Loves working for a company that puts family first.

Favorite food: Sitting down and having steamed crabs with her family.

Tom Brown
Tom Brown

Tom Brown

Lead Field Technician

Joined the company in: 2024 (but brings a lifetime of experience from previous jobs).

Personal info: Married since 1986 to his wife, Maryann. They have one adult daughter.

Favorite activities: Spending time at the beach.

Part of job that he loves to do: The final grading / finished product.

Favorite food: Anything Italian.

Sean Campbell
Sean Campbell

Sean Campbell

Field Technician

Joined the company in: 2016

Personal info: Married his wife, Lisa in 2022.

Pets: They have wild geese as pets… Marty McGoose being one of their favorites!

Favorite activities: Splitting fire wood, shooting the apple blasting cannons at Cherry Crest Adventure Farm, swimming, and attending concerts, especially at the Junction Center in Lancaster, PA.

Part of job that he loves to do: Meeting new customers and having the ability to help them out of their situations, plus help educate them. Also enjoys greeting and helping our long term customers.

Favorite food: Pizza and spaghetti with meatballs.

Jesse Peterson

Jesse Peterson

Labor/Apprentice

Joined the company in: 2020

Favorite activities: Driving around, spending time outdoors.

Part of job that he loves to do: Meeting and helping our customers.

Favorite food: Cheeseburgers.

Ranger

In Loving Memory of Our Office Dog

Ranger

Years with company: 8 years

Favorite activities: Ranger loves to get into trouble… especially getting into trash cans!

Part of job that he loves to do: Cleaning up the trash; leaving his hair everywhere, trying to escape every time the door is opened.

Favorite food: Pizza crust and popcorn.