Twin City Water Clinic was started as a single person laboratory in 1960 by John VanArsdale. The laboratory only tested for coliform bacteria in drinking water and assisted contractors with their testing needs.
60 years later, TCWC has quadrupled in size; now analyzing over 22,000 samples a year with 5 laboratory technicians. We've also expanded our certification to ensure your health is top priority, including coliform bacteria, lead, arsenic, nitrate, nitrite, and E. coli. Our clients range from contractors, home owners, schools and municipalities.
Quality Assurance & Quality Control
Our Quality Assurance Program is very intense, and we adhere to very strict procedures in every aspect of our analysis. Our goal is to make sure we're precise and complete in every test, every time!
We employ calibration curves, spikes, duplicates, internal audits, blind performance testing and other internal Quality Control. All of our analyses are traceable to national standards.
In simple language this means...
• We maintain a high criteria for ongoing calibration of our equipment.
• We run duplicate tests from different aliquots of the same sample.
• We run quality checks on specimens with added, measured contaminants to make sure that the results are accurate.
• And we continue to find ways to do more.
Certifications
We are certified by both the State of Minnesota and the State of Wisconsin. Click below to view the certifications and scope!
Meet the Team
Mollie Schmieg
Co-Owner I Office Manager
Team Member since: 2020
What makes TCWC special?
"The level of service we give to our clients is pretty amazing. We're on a first name basis with almost all of our clients and really go above and beyond for them."
Mollie is the third generation of this family owned laboratory. She has been with the team full time for over four years now and has been working part time ever since she was in high school. Mollie has experience as a marketing specialist and project manager prior to working at TCWC and puts those skills to use as the Office Manager. She loves being outside with her 4yr old and 2yr old, finding new playgrounds and hiking trails. She also can't resist a good Netflix documentary, especially when it involves true crime.
Frances Turner
Co-Owner I Laboratory Manager
Team Member since: 2018
What makes TCWC special?
"Our commitment to not only high quality results but also to outstanding customer service and meaningful client relationships"
Frances has been a dedicated member of the TCWC team since 2018 and has been the Laboratory & Technical Director since 2021. With a degree in Environmental Science from the University of Portland, Oregon, her passion for interdisciplinary work drives her many contributions. Frances is always looking for ways to optimize best lab practices and hold TCWC's quality control program to the highest standard. Outside the lab, she enjoys exploring the Twin Cities' vibrant food scene, lakes, and parks as well as trying new recipes and playing beach volleyball.
Bill VanArsdale
Client Relations
Team Member since: 1972
What makes TCWC Special?
"The time we spend with our clients. Large labs don't have the time or capacity to relate a clients test and how it will effect them. Our staff has and always will focus on giving clients a full understanding of their concerns and what services they need"
Bill VanArsdale has been with TCWC for 52 years and owned it for over 40 years with finally retiring in January of 2024. Bill worked closely with his father back when they focused on testing boilers and furnaces. Bill saw potential though in testing drinking water. The company slowly transitioned to soley focusing on drinking water and has specialized in it ever since. Bill has done an amazing job cultivating relationships, keeping pace with technology and quality control. He is now enjoying the fun parts of the job - chatting it up with clients in the field and reading his morning paper.
Abbie Schmieg
Finance & Human Resource Manager
Team Member since: 2025
What makes TCWC special?
"I love that TCWC takes pride in being a small business that helps other small businesses! It is so great to be a part of a company that keeps up with genuine relationships with customers and a commitment to serving every customer's individual needs. Every service and interaction reflects the business values that I saw growing up with my parents that own a small well drilling company. Plus, it is fun being able to work with my sister-in-law, Mollie!"
My educational background includes obtaining a Bachelor's Degree from the Univeristy of Minnesota Duluth in Criminology & Philosophy. I later switched professional directions into accounting and obtained a Bachelor's degree in Accounting from Metropolitan State University in St. Paul.
In my free time I like to spend quality time with my husband and chase after our energetic 3-year-old son who keeps life full of laughter and surprises! When I get a moment to myself to unwind I like to spend some time taking mindful walks on some nature trails or catch up on Survivor!
Nicole Yang
Laboratory Analyst
Team Member since: 2025
What makes TCWC special?
"I love how there's an effort to connect with clients. I also appreciate the opportunity to learn more and grow
my skills through independent research and instrumentation."
Nicole holds a Bachelor’s degree in Environmental Science, Policy, and Management, with minors in chemistry and statistics, bringing both analytical rigor and a passion for problem-solving to her work. Outside of her professional life, she enjoys cooking and spending time with friends.
Brad Turner
Field Specialist
Team Member since: 2024
Brad started working for TCWC in 2024 as a field rep that collects samples for our clients in the construction and real estate industry. He is a retired social worker that worked in the St. Paul School District for over 25 years. Now that Brad is retired you can find him at music festivals or concerts (from Red Rocks to First Ave) and an eclectic array of hobbies (ask him about his annual kiln firing weekend!).
Betty
Field Specialist
Team Member since: 2025
Lab Assistants
Missy
Rosie
Adrian
Buster & Fergus
Buster the pup
