Aerial view of a wastewater treatment plant with clarifier tanks and treatment basins set against Colorado's mountain landscape

Where we work

Colorado Water and Wastewater Engineering

Water and wastewater engineering in Colorado: treatment plants, lift stations, water and sewer lines, site civil and CDPHE permitting. Office in Golden.

What we do in Colorado

Water and wastewater engineering in Colorado

Modern Engineering Solutions (MES) designs water and wastewater systems across Colorado. We work for towns, water and sanitation districts, developers and other engineering firms.

Our Colorado office is in Golden. MES is licensed in Colorado and eight other states, and has completed 525+ projects.

The work runs from treatment plants and lift stations to water and sewer lines and site civil design for new development. We also study water loss and inflow and infiltration (I&I) for small utilities, and we support owners during construction.

How permitting and review works in Colorado

The Colorado Department of Public Health and Environment (CDPHE) is the main state reviewer. Its Water Quality Control Division issues discharge permits and approves the design of water and wastewater facilities.

Most new or expanded wastewater plants and lift stations with a design capacity above 2,000 gallons per day need CDPHE site location and design approval under Regulation 22. Local agencies get a chance to comment on the site application first. A Colorado-licensed professional engineer stamps the design.

New drinking water sources, treatment and storage are reviewed against the state Design Criteria for Potable Water Systems. Construction that disturbs one acre or more needs coverage under the CDPHE construction stormwater general permit.

Cities, counties and special districts review the civil plans, line extensions and taps in their own areas. Many new neighborhoods get water and sewer from a metropolitan district or a water and sanitation district. We explain the two state steps in CDPHE site application vs discharge permit.

Work in Colorado

MES has worked from the Front Range to the mountain towns. In Yampa, we designed a wastewater plant and collection system. In Conifer, we designed water plant upgrades and 40,000 feet of line rehabilitation for a water and sanitation district.

Common questions

Does a package wastewater plant in Colorado need a state permit?

Usually, yes. A plant above 2,000 gallons per day needs CDPHE site location and design approval. If it discharges to state waters, it also needs a discharge permit. Read more on package plant permitting in Colorado.

Does MES have an office in Colorado?

Yes. Our Colorado office is in Golden. Call (214) 833-6748 to talk about a project.

Can MES help with grant applications?

Yes. We have prepared grant funding documents for Colorado districts alongside the design work. See Colorado water project grants.

Projects

Work in Colorado.

Talk to an engineer

Tell us about your project.

  1. An engineer reads it

    Not a salesperson. Someone who can tell you whether the pathway is real.

  2. You get a first answer

    Your options, the agencies involved and the questions that decide cost and schedule.

  3. You decide

    No commitment to have the first call.

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