Wastewater Treatment Systems
We assess site feasibility, identify the required studies, and coordinate technical and environmental documentation for new systems, expansions, and operational improvements.
Initial project requirements
Before selecting a technology, it is essential to know the type of wastewater generated, the flow rate requiring treatment, and the intended final effluent disposal method.
Wastewater type
Determine whether the wastewater is domestic, non-domestic, or a combination of streams. This classification affects treatment parameters and disposal options.
Flow rate and pollutant load
Design requires estimating or measuring flow rates and characterizing incoming pollutant loads, considering growth, production, and operational variations.
Effluent disposal
From the outset, verify whether a sewer connection, authorized discharge, feasible reuse, or permitted subsurface disposal is available.
Key decision: Technology should not be selected solely on the basis of cost or size. It must meet the required discharge quality and actual operating and maintenance conditions.
Where will the treated water go?
Each option involves different technical requirements, quality limits, and authorities. Feasibility must be confirmed before finalizing the design.
Sanitary sewer
Verify connection availability, capacity, and discharge acceptance by the system operator. Non-domestic wastewater may require pretreatment.
- Connection availability
- Accepted quality and flow rate
- Operator requirements
Receiving water body
The effluent must meet applicable limits and have a discharge permit issued by the competent environmental authority.
- Receiving water body identification
- Discharge permit and location
- Effluent quality control
Reuse
The intended use determines required water quality, control measures, and, where applicable, the design of the application or irrigation system.
- Reuse category
- Available area and demand
- Health safeguards and monitoring
Subsurface disposal
This is permitted only for treated domestic wastewater when the site, system, and project meet the applicable regulatory conditions.
- Infiltration tests
- Soil and water table
- Groundwater protection
Technical and environmental site feasibility
The property must offer adequate space, accessibility, and environmental conditions compatible with the system and its final disposal method.
Area, setbacks, and access
Review the cadastral plan, unit locations, regulatory setbacks, personnel and vehicle access, and space for maintenance or future expansion.
Watercourses, wells, and springs
Identify water bodies, flow direction, water supply sources, and other features that constrain siting or the disposal point.
Soils and hydrogeology
Where infiltration or aquifer risks are involved, assess permeability, stratigraphy, water table, groundwater flow, and attenuation capacity.
Topography and natural hazards
Consider slopes, stormwater drainage, flooding, erosion, instability, and other conditions that could affect construction or operational continuity.
Feasibility assessment and development conditions
The assessment establishes whether the site is suitable, which additional studies are needed, and which restrictions must be incorporated into the preliminary design.
System studies, design, and documentation
The final scope depends on wastewater type, capacity, technology, and proposed disposal. These are the components that generally need coordination.
Characterization and flow measurements
Sampling, analysis, flow measurement or estimation, and definition of system influent and effluent conditions.
Design calculations report
Justification of the selected process, design loads, sizing, technical criteria, and expected effluent quality.
Construction drawings
Site layout, profiles, units, piping, disposal, measurement, sampling, access, ancillary works, and required engineering disciplines.
Soil and water studies
Infiltration tests and geotechnical, hydrological, or hydrogeological studies when required by the disposal option or associated risk.
Operation and maintenance manual
Startup, control, maintenance, safety, contingency, waste management, and quality-monitoring procedures.
Production process and control
Description of the generating process, balances, flow diagrams, instrumentation, and activity-specific parameters.
Technically consistent documentation
We integrate environmental, geological, hydrogeological, and territorial information with the design team to prevent inconsistencies between site conditions, selected technology, and permitting requirements.
- Review of background information and restrictions
- Coordination of specialized studies
- Consistency checks for plans and engineering reports
- Early identification of technical gaps
- Support in responding to institutional information requests
Permits and institutional coordination
The regulatory pathway is determined case by case. One permit does not replace other agencies' requirements or, by itself, guarantee full project authorization.
Siting and drawings
System location approval, construction plan review, inspections, and sanitary operating requirements, depending on the project.
Environmental approval
Environmental assessment of the overall project and treatment system where its classification, scale, location, or disposal method requires it.
Discharge permit
Applies when effluent is discharged into a receiving water body and includes obligations related to the environmental discharge fee.
Sanitary sewer
AyA, the municipality, or another operator verifies availability, connection requirements, and conditions for accepting the proposed flow and quality.
Developments and utilities
Subdivisions, condominiums, housing developments, and other projects may be subject to standards for design, acceptance, and future system administration.
Water resource protection
Additional assessment or coordination may be needed where subsurface disposal, aquifer vulnerability, or another sensitive condition is involved.
Regulatory note: Requirements must be checked against the current version of each regulation and the specific project circumstances at the time of submission.
Commissioning and operational compliance
Design approval is only one stage. The system must operate continuously, maintain records, and meet applicable effluent limits.
Commissioning
Verification of equipment, operating sequences, flows, control parameters, and process stabilization.
Operating logs and monitoring
Records of operation, maintenance, measurements, sampling, incidents, corrective actions, and sludge management.
Operational reports
Submission of results and system performance assessments at the frequency required by applicable regulations and discharge type.
Sludge and biosolids
Characterization, storage, transport, treatment, and disposal through authorized methods.
Projects we can support
Our methodology adapts to new projects, existing systems, and activities that generate domestic or non-domestic wastewater.
Housing developments and condominiums
Shared treatment systems, pumping stations, internal networks, and arrangements for future operation and administration.
Hotels, restaurants, and shopping centers
Occupancy fluctuations, grease, peak flows, and reuse or discharge alternatives.
Production processes
Characterization of non-domestic wastewater streams, pretreatment, treatment, and monitoring of activity-specific parameters.
Farms and processing facilities
Variable organic loads, seasonality, by-product recovery, and water resource protection.
Educational, healthcare, and public facilities
Solutions tailored to the population served, service continuity, and available operating capacity.
Expansions and improvements
Assessment of noncompliance, increased flow, changes in activity, rehabilitation, or regularization of documentation.
Our process
We organize projects around technical decisions to reduce redesign and produce consistent documentation.
Initial review
We review the activity, location, plans, utility availability, background information, and existing system conditions.
Characterization
We define wastewater type, flow rates, loads, variability, and required effluent quality.
Feasibility
We verify the site, setbacks, hazards, and alternatives for discharge, reuse, or subsurface disposal.
Design and studies
We coordinate design bases, specialized studies, engineering reports, plans, and manuals.
Permit management
We prepare and follow the applicable institutional process, responding to technical observations.
Startup and follow-up
We support system verification, operational monitoring, and compliance planning.
When should you contact us?
Early evaluation helps avoid purchasing unsuitable equipment, setting aside insufficient space, or discovering too late that the proposed discharge is infeasible.
Before finalizing site design
- No sanitary sewer is available.
- You are considering purchasing, subdividing, or developing a property.
- The project proposes treated wastewater reuse or infiltration.
- Space and access for the system must be reserved.
- The activity will generate non-domestic wastewater.
Before expanding or replacing equipment
- Effluent repeatedly fails to meet applicable standards.
- Odors, overflows, or excessive sludge are occurring.
- Flow rate, population served, or production will increase.
- The activity or wastewater composition will change.
- Plans, manuals, permits, or operating records are missing.
Recommendation: Evaluate the site and final disposal method first; then compare technologies and investment, energy, operating, maintenance, and replacement costs.
Choose a feasible solution before investing
Tell us about your activity, location, estimated wastewater flow, and the discharge option you are considering. We will review your case and identify the studies and procedures worth evaluating.
- New projects
- Existing systems
- Throughout Costa Rica