The most effective Solution of Water Pollution is to combine pollution prevention, wastewater treatment, and continuous water quality monitoring. Pollution should first be reduced at the source, then treated before discharge, and finally monitored to verify treatment performance and detect abnormal changes. For industrial facilities, municipal WWTPs, and environmental projects, this approach is more reliable than relying on treatment alone because it addresses both pollution control and ongoing risk management.
Prevent → Treat → Monitor
- Prevent: Reduce pollutants through source control, chemical segregation, leak prevention, and process optimization.
- Treat: Remove contaminants using physical, biological, chemical, or advanced wastewater treatment.
- Monitor: Track pH, DO, COD, turbidity, ammonia, conductivity, and flow to verify water quality and identify abnormal discharge.
What Is Water Pollution?
Water pollution is the contamination of any water system or body of water, from lakes and oceans to groundwater. Thanks to media coverage, we are very aware of the problem of water pollution, especially when we are still producing harmful chemicals and entering our waters thus causing a reduction or loss of water use.
When water is polluted, acids, bases, oxidizers, and compounds such as copper, cadmium, mercury, arsenic, and organic toxins such as benzene, dichloroethane, and ethylene glycol in the sewage can poison aquatic life and affect drinking water sources and scenic landscapes. The organic matter in the sewage is decomposed by microorganisms when consuming oxygen in the water, affecting the life of aquatic organisms. After the dissolved oxygen in the water is depleted, the organic matter undergoes anaerobic decomposition, producing unpleasant gases such as hydrogen sulfide and mercaptan, which further deteriorate the water quality. It can adversely affect plants and animals (which depend on unpolluted water) as well as the sensitive water environment.
Global warming is increasing and it is a problem we cannot afford to turn a blind eye to. With climate change and global warming, our precious planet is beginning to move toward a water crisis. Our global population is increasing, putting demands on water supplies, and as a result, we are seeing an increase in waterborne diseases due to the pollution of our waters.
What Causes Water Pollution?
To find a solution to the problem of water pollution, we must first understand what causes it. The causes of water pollution can range from overdevelopment to improper sewage treatment.
Once the cause of water pollution is determined, solutions can be developed to address the problem.
Water pollution can come from any of the following.
- Urban development
- Sewage and wastewater
- Mining
- Agricultural fertilizers and pesticides
- Oil spills
- Burning of fossil fuels
- Ocean dumping
- Sewer leaks
- Global warming
- Acid Rain
- Animal manure
- Eutrophication
- Radioactive waste
In most real-world cases, water pollution is caused by a combination of multiple sources rather than a single factor, which makes comprehensive monitoring and integrated treatment strategies essential.
Water Pollution Control Workflow
Water pollution control is a systematic process that starts with identifying abnormal water quality conditions, followed by accurate instrument monitoring and data analysis. By measuring key parameters such as pH, turbidity, DO, COD, and ammonia nitrogen, operators can better understand pollution sources, evaluate water quality trends, and choose the most suitable treatment methods. This workflow helps improve response speed, treatment efficiency, and long-term water quality management.
Key Environmental Data Related to Water Pollution
| Indicator | Latest Data | Source |
| Household wastewater not safely treated before discharge | 42% in 2022 | UN-Water 2024 |
| Household wastewater released with inadequate or no treatment | 113 billion m³ in 2022 | UN-Water 2024 |
| People without safely managed drinking water | 2.2 billion in 2022 / 2.1 billion in 2024 | WHO / UNICEF |
| Global safely managed drinking water coverage | 74% in 2024 | UNICEF |
| People collecting water directly from surface water sources | 106 million in 2024 | UNICEF |
| People without safely managed sanitation | 3.5 billion | UN-Water 2025 |
| People practising open defecation | 419 million | UN-Water 2025 |
10 Solutions to Water Pollution
We can divide the water pollution problem into 10 main solutions.
- Waste water treatment
- Reduce plastic waste
- Water conservation
- Water-saving toilets
- Septic tanks
- Do not use toilets as garbage bins
- Rainwater Management
- Green Agriculture and Wetlands
- Denitrification
- Ozone Wastewater Treatment
Solutions by Pollution Type
| Pollution type | Main sources | Recommended solutions | Key monitoring / compliance indicators |
| Domestic wastewater | Residential sewage, kitchen wastewater, scattered rural discharge | Rainwater-sewage separation, septic pretreatment, biological treatment, constructed wetlands, sewer connection to treatment plants; in rural areas, use combined biological and ecological processes. | COD, BOD5, SS, ammonia nitrogen, total phosphorus, total nitrogen, fecal coliforms. |
| Industrial wastewater | Manufacturing, chemicals, pharmaceuticals, ceramics, textile dyeing, etc. | Segregated collection, pretreatment by stream, source reduction, advanced treatment, stable discharge compliance; apply industry-specific discharge standards for high-risk sectors. | COD, TOC, specific pollutants, pH, heavy metals, total dissolved solids, color. |
| Agricultural runoff | Fertilizers, pesticides, livestock manure, soil erosion | Source reduction, interception, nutrient reuse, ecological restoration; use sedimentation ponds, infiltration trenches, vegetated buffer strips, and constructed wetlands. | Nitrogen, phosphorus, turbidity, suspended solids, pesticide residues. |
| Plastic waste | Single-use plastics, packaging waste, floating debris in rivers and coastlines | Source reduction, product substitution, recycling, extended producer responsibility (EPR), cleanup campaigns, interception devices, and safe final disposal. | Collection rate, leakage volume, recycling rate, shoreline cleanup volume. |
The approach to managing different types of pollution varies. For domestic sewage, the focus is on “collection, treatment, and stable operation and maintenance”; for industrial wastewater, the focus is on “pre-treatment based on quality classification and discharge in compliance with standards”; for agricultural runoff, the focus is on “reduction at the source and interception of non-point sources”; and for plastic waste, the focus is on “reduction, recycling, and interception.”
Wastewater Treatment
Treating water before it enters the waterway system may be the most effective way to reduce water pollution – at the source!
Wastewater treatment facilities have the technology and tools to remove most contaminants through biological, physical and chemical processes. For example, wastewater treatment allows water to flow through different disinfection chambers to reduce the toxicity levels of water contaminants and prevent leakage into the water system.
To ensure proper operation of wastewater treatment, regular maintenance of the equipment is required. This includes applications such as water treatment sensors, which are critical for measuring and removing contaminants to reduce water pollution.
Water treatment sensors.
- pH sensors
- Redox potential (ORP) sensors
- Conductivity sensors
- Dissolved oxygen (DO) sensors
- Turbidity sensors
- COD sensors
- Ammonia nitrogen sensors
- Nitrate sensors
Reducing Plastic Waste
Plastic waste is a big problem. The fact that more than 10 tons of plastic enter our oceans every year and that there are expected to be more plastics than fish by 2050 is alarming! Plastic waste can also corrupt water supplies. That’s why it’s important to reduce plastic waste and improve sustainability globally.
Plastic bottles and bags get most of the media coverage, but plastic is entering water systems in ways you can’t always see, and likely don’t realize.
Microplastics are a major problem and are found in
- Industrial manufacturing
- Synthetic textiles
- Clothing
- Personal care products (toothpaste, shampoo, etc.)
To reduce plastic waste in our homes, we can do the following.
- Recycle plastic
- Use alternatives to plastic, such as reusable tableware, food bags, etc.
- Shop locally and buy fruits and vegetables that are not packaged in plastic
- Buy organic/natural and eco-friendly care products
Water Conservation
Do you turn off the tap when you brush your teeth, or turn off the tap when you wash your hair in the shower?
Water is a scarce resource, so limiting the amount of water you use each day will help reduce water pollution.
Water Efficient Toilets
In the past, toilets used about 3.5 gallons of water per flush, however, the EPA (Environmental Protection Agency) has mandated that all toilets can only flush 1.6 gallons of water per flush.
Most homes are now built with 2 button toilets, one for small flushes (0.8-1.1 gallons of water) and one for full power (1.6 gallons of water). Water-efficient toilets are a step in the right direction to conserve water and reduce water pollution.
Having a water-efficient toilet can save you money, too!
Septic Tanks
Septic tanks are a great way to effectively treat wastewater; separating solids from liquids. Septic tanks degrade solids and allow liquids to flow into the drainage system through a biological process.
Using a septic tank reduces water pollution by removing pollutants already present in the water.
Do not use your toilet as a trash can
Your toilet is not a trash can; it is used only for human excrement. Avoid flushing wet wipes, diapers and anything else you think of down the toilet – that’s what a trash can is for.
Flushing these items down the toilet can cause a clog in the drain, so the sewer system does not work properly. When things are clogged, the water in the wastewater facility or septic tank cannot be cleaned effectively.
Stormwater Management
Another way we can fight water pollution is to manage stormwater whenever possible. Stormwater flows along roads and other surfaces and can collect viruses, bacteria and other harmful pollutants before entering sewers, rivers and eventually the ocean.
Treatment and management of stormwater includes reverse osmosis (RO), advanced oxidation and sand filtration.
Green Agriculture and Wetlands
Agriculture is a trillion dollar industry worldwide, using up to 70% of the surface water supply to meet the needs of livestock production and agriculture.
Because agriculture is such a large industry, it is one of the leading causes of water pollution. When it rains, runoff transports pesticides and fertilizers.
Agriculture can be environmentally friendly and is known as green farming. Green farming involves the use of pesticides and fertilizers that do not contain harmful chemicals. It also involves planting trees and creating wetlands to create buffers that filter runoff and water pollutants.
Denitrification
When nitrate levels in water are high, it creates the perfect environment for eutrophication or over-fertilization of runoff to occur. This allows algae and phytoplankton in the water to grow rapidly, reducing water quality and exacerbating water pollution problems.
Denitrification is the direct conversion of nitrate to nitrogen. This ecological process prevents nitrate from leaching into the soil and helps reduce groundwater contamination.
Ozone Wastewater Treatment
Although this is also a type of wastewater treatment, it goes through a different process than conventional wastewater systems, which is why it is also important to note this.
Ozonated wastewater treatment uses an ozone generator to break down water contaminants. Ultraviolet (UV) radiation or an exothermic field inside the generator converts oxygen into ozone. This process oxidizes bacteria, organic matter and other water contaminants.
Industrial Water Pollution Solutions
| Process / Pollution Source | Main Risk | Parameters to Monitor | Instrumentation |
| Equalization / Neutralization | pH shock, chemical load | pH, ORP, conductivity, flow | pH/ORP sensor, conductivity sensor, flow meter |
| Biological Treatment | Insufficient aeration / nitrification | DO, ORP, pH, NH₄-N | DO, ORP, ammonia sensors |
| Clarification | Solids carryover | Turbidity, TSS | Turbidity/TSS sensor |
| Disinfection | Insufficient/excess disinfectant | Chlorine, ORP, pH | Residual chlorine, ORP sensor |
| Final Effluent | Non-compliant discharge | pH, COD, NH₄-N, turbidity/TSS, flow | Online analyzers + flow meter |
| Receiving Water | Environmental impact | pH, DO, conductivity, turbidity, nutrients | Multiparameter monitoring system |
How an Online Water Pollution Monitoring System Works
An online water pollution monitoring system continuously measures key water quality parameters and transfers field data to a central monitoring platform. Unlike periodic manual sampling, continuous monitoring helps operators identify abnormal changes earlier, evaluate treatment performance, and respond more quickly to potential pollution events.
A typical monitoring architecture can be configured as:
Water → Sensor → Controller/Transmitter → RS485 / 4–20 mA → RTU/DTU → 4G/WiFi → Cloud Monitoring Platform → Alarm & Process Adjustment
Depending on the application, the monitoring system may include sensors for pH, ORP, conductivity, TDS, dissolved oxygen, turbidity, TSS, chlorine, temperature, and flow. Field instruments transmit measurement data through industrial signals such as 4–20 mA, RS485 Modbus RTU, or RS232, while an RTU or DTU can send the collected data to a remote platform through 4G or WiFi communication.
This architecture is suitable for industrial wastewater treatment plants, municipal WWTPs, water treatment facilities, aquaculture systems, and environmental monitoring projects. Operators can use real-time data to follow water quality trends, detect abnormal conditions, review historical records, and support treatment-process adjustments.
A similar architecture can also be deployed for remote surface-water monitoring. For example, a Dubai lake monitoring project used multi-parameter monitoring buoys, 4G/GPRS transmission and cloud-based data management for continuous water quality monitoring. See the Dubai project.
Real-World Water Pollution Monitoring Project: Dubai
Water pollution control also depends on detecting changes before they develop into larger environmental problems. In a Dubai lake monitoring project, a continuous monitoring network was implemented to replace the limitations of periodic manual sampling.
Ten integrated water quality monitoring buoy systems were deployed at key monitoring locations. The systems continuously measure parameters including pH, ORP, turbidity, chlorophyll and temperature, while 4G/GPRS communication transfers field data to a cloud platform for remote visualization and management. Solar power allows the monitoring stations to operate independently in remote lake environments.
This type of monitoring architecture helps environmental operators establish continuous water quality baselines, identify abnormal parameter changes and improve response to potential pollution events.
[View the Dubai Water Quality Monitoring Buoy Project →]
How Do We Test and Measure Water Contamination?
Testing and measuring water quality can tell us if a body of water is contaminated. Testing water quality is one of the most important ways to protect sensitive aquatic environments and provide clean water for a wide range of plants and animals, including humans.
pH Testing
pH fluctuations can be extremely dangerous in aquatic systems; safe aquatic environments have pH values between 6.0 and 8.0. Many factors can alter the pH of an aquatic system, rapidly creating a toxic environment.
pH can be tested using colorimetric or electrochemical methods.
Colorimetric methods include pH indicators and litmus paper. They are easy to use and inexpensive, but for accurate pH readings, electrochemical methods such as pH controller are highly recommended. The pH meter needs to be calibrated prior to use.
You can find more information about pH sensors and their different applications here.
Conductivity, Salinity and TDS Monitoring
The conductivity of water tells us the quality of the water and also affects the salinity and TDS (total dissolved solids) of the water. Analyzing water quality can be measured using conductivity, TDS and salinity meters.
Even if each meter measures a different water parameter, the results will collaborate with each other to indicate how much water contamination is present.
Measuring Water Temperature
Temperature is an important water quality parameter because it affects other parameters in the water system.
There are a variety of thermometers, temperature controllers and temperature sensors that can record accurate readings.
Measuring Dissolved Oxygen
Measuring dissolved oxygen in wastewater treatment and water bodies is important because DO levels below 6 mg/L can be toxic to aquatic ecosystems.
Most commonly used are DO electrochemical sensors, but optical DO sensors, colorimetric methods can also be used.
Assessing Turbidity and Total Suspended Solids (TSS)
Turbidity is the degree to which water becomes cloudy and is an important test of water quality. tss (total suspended solids) and decaying plant and animal matter can alter turbidity levels, often reducing the amount of light that passes through the water.
A sudden increase in turbidity indicates water contamination, usually caused by the influx of heavy metals and other sewage.
The easiest way to measure turbidity is with a turbidity tube or Secchi disc, but for more accurate measurements, a turbidity meter is recommended.
Chlorophyll Fluorescence Analysis
When water bodies become eutrophic, oxygen levels are depleted and nitrogen and phosphorus levels increase, creating a toxic environment for plants and animals. Measuring algal growth and water quality can help reduce water pollution.
Chlorophyll fluorescence is measured with a chlorophyll sensor, which records the percentage of wet chemistry and active chlorophyll.
CDOM/FDOM Monitoring
CDOM (colored dissolved organic matter) is naturally present in water bodies. UV light is absorbed by the organic matter and breaks down to release the organic contaminant tannin, which makes the water cloudy. Tannins are associated with lowering the pH and depleting the oxygen content of the water. When CDOM fluoresces, it is referred to as fluorescent dissolved organic matter (FDOM).
Photoelectric sensors are used to measure CDOM/FDOM. they measure the availability of light and the concentration of dissolved organic matter (DOM).
What Information Is Needed to Select a Water Quality Monitoring System?
| Engineering Data | Example |
| Application | Industrial wastewater / WWTP / river |
| Industry | Chemical, food, textile, mining, etc. |
| Parameter | pH, DO, COD, ammonia, turbidity… |
| Expected range | Process-specific |
| Water temperature | °C |
| Process pressure | bar |
| Pipe diameter | DN / mm |
| Installation | Tank, pipeline, channel, immersion |
| Solids / fouling | Low / medium / high |
| Chemical composition | Acids, alkalis, solvents, salts |
| Signal required | 4–20 mA / RS485 |
| Communication | Modbus / remote monitoring |
| Monitoring objective | Process control / discharge / alarm |
Summarizing Solution of Water Pollution
Water pollution is an extremely important problem we are currently facing, which is why solutions must be developed to protect the aquatic environment, human health, and other animals (and plants) that depend on water systems.
Testing different water parameters will determine water quality so that water pollution can be identified.
If you would like more information on what water quality testing equipment we offer, please feel free to contact Apure. We look forward to answering any questions you may have.
FAQ
References
[1] U.S. EPA. How Can You Help Protect Source Water?[EB/OL]. 2026-02-12[2026-05-21]. https://www.epa.gov/sourcewaterprotection/how-can-you-help-protect-source-water.
[2] ESD Waste2Water. How to Solve Water Pollution[EB/OL]. [2026-05-21]. https://www.waste2water.com/solving-pollution-problem/.
[3] Solar Impulse Foundation. How to improve water quality?[EB/OL]. [2026-05-21]. https://solarimpulse.com/topics/water-pollution.
[4] Inspire Clean Energy. Ways To Reduce Water Pollution[EB/OL]. [2026-05-21]. https://www.inspirecleanenergy.com/blog/sustainable-living/ways-to-reduce-water-pollution.
[5] UN-Water. Progress on Ambient Water Quality – 2024 Update.
https://www.unwater.org/publications/progress-ambient-water-quality-2024-update
[6] World Health Organization (WHO). Guidelines for Drinking-Water Quality.
https://www.who.int/teams/environment-climate-change-and-health/water-sanitation-and-health/water-safety-and-quality/drinking-water-quality-guidelines
[7] U.S. Environmental Protection Agency (EPA). Industrial Wastewater Treatment Technology Database (IWTT).
https://www.epa.gov/eg/industrial-wastewater-treatment-technology-database-iwtt