COMMERCIAL SERVICES
Commercial Services
Commercial Wastewater systems really encompass a broad range of systems.
In brief, this is any system that isn’t for a residence. This includes such things as:
- Schools
- Manufacturing Facilities
- Shopping Centers
- Restaurants
- Subdivision Central Plants
- Municipalities
- Resort and Conference Centers
- Retreat Camps
- Retreat Camps
- Hunting/Fishing Lodges
- RV Parks
- Hotels/Motels
- Breweries
- Medical Centers
- Amusement Parks
- and more
Generally, a commercial wastewater system is anything that is either high strength sewage. Our designs, done by a Registered Professional Sanitarian, can be either local permit level, or state permit level through Texas Commission on Environmental Quality ( TCEQ ). This can be a discharge permit, or a non-discharge permit.

Commercial Services
Commercial Wastewater systems really encompass a broad range of systems.
In brief, this is any system that isn’t for a residence. This includes such things as:
- Schools
- Manufacturing Facilities
- Shopping Centers
- Restaurants
- Subdivision Central Plants
- Municipalities
- Resort and Conference Centers
- Retreat Camps
- Hunting/Fishing Lodges
- RV Parks
- Hotels/Motels
- Breweries
- Medical Centers
- Amusement Parks
- and more
Generally, a commercial wastewater system is anything that is either high strength sewage. Our designs, done by a Registered Professional Sanitarian, can be either local permit level, or state permit level through Texas Commission on Environmental Quality ( TCEQ ). This can be a discharge permit, or a non-discharge permit.

The Commercial Process is Vastly Different.
In the State of Texas, there is a “trigger point” in the permit process, as to how a permit is obtained for a wastewater system, be it on onsite system, or central collection system.
If your flows exceed a certain average daily flow limit,
you must obtain a permit from the Texas Commission on Environmental Quality. This process can be quite time consuming.
If your flows fall below this limit (currently 5,000 gpd)
you can often (but not always) obtain a permit from your local Regulatory Authority. It is important to understand that your effluent “strength” may also require you to design and construct a “commercial” system. Any sewage beyond a biochemical oxygen demand of 140 mg/L BOD is considered “high strength”, or with other unusual components (such as fats, oils, greases, or unusually high suspended solids). This can actually happen in a residence, too. With onsite commercial systems it is vitally important to not only address the hydraulic loading of the system (how many gallons per day/week/month/year and any unusual “peak” events), but more importantly the biological loading, in terms of the waste stream being put “down the drain”. Different types of commercial establishments generate vastly different sewage strengths, often at different times of the day, and we will help you identify these items for a proper design by a Professional Engineer for your site. You may be told that there are “charts” from which a cookbook design may be done. This is not true. Each commercial design needs to be site specific, and designed with the specific operating conditions of the site, the ability of the soils on the site to process the mass-loading of the effluent, and the intended use of the system carefully considered. Lack of proper planning and operation often results in costly system failure. If you find someone with an inexpensive “cookbook” design, please be aware that even if you get a permit from your local agency, the issuance of a permit does not guarantee the system will work. The Permit Authority relies upon the designer to properly design the system, and current State Codes are design minimums, only.
For permits over 5,000 gpd, our firm collects data on actual mass and hydraulic
loadings, and sizes a plant, with proper flow equalization, pre-treatment, and clarifiers where they will do the most good, in the most cost-effective manner, in terms of life-cycle. Additionally, please note that the use of pre-existing small scale aerobic treatment units, that carry a NSF Class I rating, and on a State-approved list, are for Residential Use ONLY. While they may be used in smaller commercial systems, State Law requires you use the services of a Registered Professional Engineer to design such systems, as you are modifying the use for which these units were originally intended.
Our firm has diverse experience in all sizes of systems.
We have been involved with phased systems that exceed several hundred thousand gallons per day.
- We recommend that you consult with a Licensed Registered Engineer before you expend any major funds on a property purchase. A little money spent doing a feasibility can save you thousands of dollars later. There are a variety of cost-effective methods to treat and dispose of effluent. Let us show you how. Please contact us for our current fee schedule to perform feasibility analysis for your project. Fast track work is available (for performing due diligence during a real estate option period).
Discharge Types
- Effluent Storage Tank Under Construction
- Large Drip Irrigation System
This is one of many questions that must be considered in the design process. In short, do you want to do a direct discharge of your effluent, or do you want to keep all effluent onsite? We can “run the numbers” on the most cost-effective manner in which to treat – and therefore dispose of – your proposed effluent. .
Commercial and High Strength Zero Discharge Wastewater Systems and Wastewater Treatment Plants
A commercial wastewater treatment plant system, onsite sewage facility (OSSF), or commercial wastewater system, covers pretty much everything that is not residential. This includes schools, hotels, conference centers, convenience stores, vet clinics, motels, apartments, factories, manufacturing facility areas, wineries, breweries, restaurants, distilleries, conference centers, RV parks, marinas, and more. We design, permit, construct, and operate systems up to 500,000 gpd in the State of Texas. The permit requirements are vastly different, under the Texas Administrative Code, for such systems.

A commercial wastewater treatment plant system, onsite sewage facility (OSSF), or commercial wastewater system, covers pretty much everything that is not residential. This includes schools, hotels, conference centers, convenience stores, vet clinics, motels, apartments, factories, manufacturing facility areas, wineries, breweries, restaurants, distilleries, conference centers, RV parks, marinas, and more. We design, permit, construct, and operate systems up to 500,000 gpd in the State of Texas. The permit requirements are vastly different, under the Texas Administrative Code, for such systems.
Currently, any system over 5,000 gpd requires a State issued permit. We can design and permit these systems, either for zero-discharge, or discharge systems.
FREQUENTLY ASKED QUESTIONS
What makes commercial septic system design different from residential systems?
Commercial septic systems must accommodate significantly higher usage volumes and waste loads than residential systems. They require detailed analysis of site conditions, wastewater flow projections, regulatory requirements, and engineering constraints. Environmental Design Group designs commercial systems with scalability, environmental compliance, and sustainability in mind—often including grease traps, lift stations, or advanced treatment technologies. Failing to account for these complexities during design can lead to system failure, fines, or costly retrofits.
What is the first step in starting a commercial septic system project?
The process begins with a comprehensive site evaluation, including soil testing, percolation rates, topography, zoning, and groundwater conditions. Environmental Design Group uses this data to assess system feasibility and recommend the most appropriate type of system. The site evaluation helps prevent surprises later in permitting or construction and ensures the system will perform efficiently and in compliance with Texas Commission on Environmental Quality (TCEQ) standards.
Is it possible to expand or modify a commercial septic system later on?
Yes, but only if the original system was designed with scalability in mind. Environmental Design Group often incorporates modular or phased systems for clients anticipating future growth. This approach allows businesses to expand operations without a complete redesign. However, if the system was undersized from the start, expanding may require a full reevaluation. Investing in flexible design upfront can save significant time and money later.
What are common mistakes businesses make when planning septic systems?
A common mistake is underestimating wastewater volume or planning for too little daily usage, especially in food service or hospitality industries. Others fail to consider long-term maintenance or assume a “one-size-fits-all” approach. Environmental Design Group helps avoid these pitfalls by conducting thorough usage analysis, future-proofing the design, and aligning system choices with operational needs and environmental regulations from the start.
Can a poorly designed commercial septic system affect business operations?
Absolutely. A septic system failure can lead to business shutdowns, health code violations, costly emergency repairs, and even legal consequences. Overflow, odor issues, and system backups directly impact employee safety and customer satisfaction. Environmental Design Group’s designs focus on durability, regulatory compliance, and reliability to ensure seamless business operations without unexpected disruptions or liabilities.
Do commercial septic systems need special maintenance plans?
Yes. Unlike residential systems, commercial systems experience heavier loads and more complex use patterns, requiring customized maintenance schedules and professional inspections. Environmental Design Group can recommend long-term maintenance strategies, including sludge monitoring, pump schedules, and cleaning timelines to extend system life and performance. Proper upkeep is often required for maintaining regulatory compliance and avoiding penalties.
How does soil composition affect septic system design?
Soil type dictates drainfield size, placement, and feasibility. Sandy soil may drain too fast, while clay soil may retain too much water, creating potential failure zones. Environmental Design Group performs soil profiling and percolation testing during the site evaluation to determine whether traditional systems will work or if engineered systems are needed. Understanding soil behavior is key to designing a system that functions efficiently over time.
What are the benefits of choosing an engineered system over a standard design?
Engineered systems offer greater design flexibility, higher performance in challenging site conditions, and often smaller environmental footprints. They're ideal for limited-space properties, high-usage businesses, or poor soil conditions. Although they cost more upfront, they often reduce long-term risk and maintenance costs. Environmental Design Group evaluates both standard and engineered systems to provide the most cost-effective, regulatory-compliant solution.
How do commercial septic systems impact the environment?
Improperly designed or maintained systems can contribute to groundwater contamination, surface runoff pollution, and ecological damage. Environmental Design Group prioritizes environmental safety by incorporating best practices such as watertight tanks, secondary treatment units, and optimized drainfield design. Our designs aim to protect nearby water bodies, wildlife habitats, and community health while helping businesses meet environmental responsibility goals.
Can commercial septic systems be designed for zero-waste or eco-friendly operations?
Yes. While no system is completely zero-waste, eco-conscious systems can be designed with secondary treatment options, constructed wetlands, or greywater recycling components. These reduce the burden on traditional drainfields and allow wastewater to be reused for irrigation or non-potable purposes. Environmental Design Group consults with eco-minded businesses to align septic designs with LEED certification or sustainability targets.
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