Water and wastewater engineering firms design treatment processes, hydraulic systems, filtration, aeration, and control systems for municipal and industrial water and wastewater facilities. The technical challenges can include developing treatment processes for specific contaminant targets, engineering hydraulics for complex flow conditions, improving filtration and aeration performance, and optimizing control systems for energy and process performance. This page explains what development work may look like in a water and wastewater engineering business and how it relates to qualified research under Section 41. It is educational and is not individualized advice.
What R&D May Look Like in Water & Wastewater Engineering
Water and wastewater engineering involves process development, hydraulic design, filtration and aeration engineering, and control system development. Technical development may arise when a firm develops a new treatment process for a contaminant target, engineers hydraulics for complex conditions, improves filtration or aeration performance, or develops control systems for energy or process optimization. Work directed at resolving genuine technical uncertainty in these areas — through a structured evaluative process — may warrant review under the four-part test.
Industry-Specific Examples of Technical Development
- Developing treatment processes for specific contaminant targets where the process performance is uncertain.
- Engineering hydraulics for complex flow conditions where the hydraulic performance is uncertain.
- Improving filtration and aeration performance where the performance is uncertain.
- Developing control systems for energy and process optimization where the control performance is uncertain.
- Resolving unusual influent or effluent challenges where the treatment performance is uncertain.
None of these constitutes qualified research by itself. Each depends on whether the work satisfies all four elements of the four-part test.
Technical Uncertainty Examples
- Whether a new treatment process can achieve the specified contaminant-reduction target under varying influent conditions.
- Whether a modified hydraulic design can achieve the specified flow distribution under complex conditions.
- Whether an improved filtration approach can achieve the specified performance target with reduced energy use.
For more, see our page on elimination of uncertainty.
Process-of-Experimentation Examples
- Running treatment process tests with alternative approaches, measuring contaminant reduction, and comparing results.
- Building hydraulic test models, conducting flow testing, and evaluating results.
- Testing alternative filtration or aeration methods, measuring performance and energy use, and comparing results.
For more, see our page on process of experimentation.
Potential Business Components
Potential business components may include a new or improved product (a treatment system with improved performance), a new or improved process (a treatment or hydraulic process), or a new or improved technique (a filtration, aeration, or control method).
Employee Work That May Warrant Analysis
Employees whose work may warrant analysis include process engineers developing treatment processes, hydraulic engineers developing flow systems, and control engineers developing optimization systems tied to a development project. For more, see our page on R&D tax credit employee wages.
Contractor Work That May Warrant Analysis
Contractor work that may warrant analysis includes treatment process vendors, filtration and aeration suppliers, and testing laboratories — where the firm bears the economic risk and retains substantial rights. For more, see our page on R&D tax credit contractor costs.
Supplies and Materials That May Become Relevant
Supplies that may become relevant include treatment media, filter material, and test reagent consumed in testing. For more, see our page on R&D tax credit supplies.
Activities That Generally Require Caution or May Not Qualify
- Routine engineering design using established processes and methods.
- Standard hydraulic calculations following established procedures.
- Ordinary system specification and selection.
- Copying an existing treatment process for a new facility.
- Normal quality control and inspection following established procedures.
Documentation That May Help
Records that may help include project descriptions, treatment process test results, hydraulic test data, filtration and aeration performance records, and records connecting personnel and materials to specific development projects. For more, see our page on R&D tax credit documentation.
Example Hypothetical Project
The following is a hypothetical example for illustration only. It does not represent any actual company and does not state that the work qualifies.
A water and wastewater engineering firm is developing a treatment process for an industrial wastewater stream with an unusual contaminant profile where the standard process does not achieve the specified effluent target. The technical uncertainty is whether a modified treatment sequence, an alternative filtration approach, and a new aeration protocol can together achieve the contaminant-reduction and energy targets. The team runs treatment tests with three process sequences and two filtration approaches, measures contaminant reduction and energy use, and evaluates aeration performance. Based on the results, the team selects a treatment and filtration approach and refines the aeration protocol. Records of the alternatives, test conditions, and results may help support analysis — but professional review is still needed.
Questions to Ask Internally
- What specific business component was being developed or improved?
- What technical uncertainty existed at the outset?
- What alternatives were evaluated, and how were they tested?
- Who performed or directly supported the work?
- What materials were consumed in the testing?
- How does this differ from routine engineering design?
Relationship to the Four-Part Test
The four-part test applies the same way it does in any industry. The work must be directed at developing or improving a business component (permitted purpose), must fundamentally rely on principles of the physical sciences or engineering (technological in nature), must be intended to eliminate a technical uncertainty (elimination of uncertainty), and must be conducted through a structured evaluative process (process of experimentation). Meeting one element is not enough.
Key Takeaway
Water and wastewater engineering firms may perform activities that warrant analysis under IRC §41 — particularly work involving treatment processes, filtration, aeration, and control systems. Routine engineering design does not automatically qualify. Professional review is appropriate. For related industries, see our pages on civil engineering firms and MEP engineering firms.