Hiyoshi, an environmental technology company based in Japan’s Shiga Prefecture, is seeking to extend its water and environmental-protection work in India, with attention focused on stronger water and sewage-system capacity amid changing rainfall. The company’s experience is rooted in the recovery of Lake Biwa, where it was entrusted with monitoring water quality and managing septic tanks as residents stopped using synthetic detergent because of red tides. The development was reported by Asianet Newsable on 21 October 2026.
The initiative has no disclosed plant capacity, contract value, procurement package or implementation timetable. Hiyoshi CEO Tadashi Suzuki said the company wants to transmit its environmental-protection technology to India, where he said rising rainfall requires greater water and sewage-system capacity Asianet Newsable.
Key takeaways
- Hiyoshi began as a waste-treatment service provider in 1955 and later expanded into water and sewage analysis and air-condition analysis Asianet Newsable.
- During the Lake Biwa recovery work in 1977, Hiyoshi measured water quality, set clean-water criteria and managed septic tanks Asianet Newsable.
- The Lake Biwa work earned Hiyoshi the reputation “Guardian God of Environment” Asianet Newsable.
- Hiyoshi said 1,110 overseas researchers from 53 countries had visited to study its advanced technology Asianet Newsable.
- Hiyoshi now wants to transfer environmental-protection technology to India, with water and sewage-system capacity identified as a priority Asianet Newsable.
From Lake Biwa to an India expansion focus
Hiyoshi’s history began with waste-treatment services in 1955, under a policy of creating a “symbiosis society of human being and nature.” Its work initially covered wastewater-treatment operation and maintenance before adding water and sewage analysis, followed by air-condition analysis Asianet Newsable.
A major turning point came in 1977 with efforts to recover clean water in Lake Biwa. According to Hiyoshi CEO Tadashi Suzuki, synthetic detergent was contributing to red tides, prompting citizens, particularly housewives, to stop using it. Hiyoshi was then entrusted with measuring water quality, establishing clean-water criteria and managing septic tanks, which Suzuki said contributed to the lake’s recovery Asianet Newsable.
That work led to international interest in the company’s technology. Suzuki said cooperation requests came from Asia and the United States, and that 1,110 overseas researchers from 53 countries visited to study Hiyoshi’s technology Asianet Newsable.
“Along with economic growing awareness to keep environment is rising dynamically. Hiyoshi wants to transmit environment protection technology to India,” Suzuki said Asianet Newsable.
He linked the company’s India interest to rainfall and system-capacity pressures, saying that increasing rain requires water and sewage systems to handle twice as much rainfall, while reduced rain in Japan had lowered Lake Biwa’s oxygen levels and increased algae that damaged water quality Asianet Newsable.
Specification read
No project scale was reported for Hiyoshi’s proposed India work. The available information does not specify design flow in cubic metres per day, population equivalent, pollutant concentrations, treatment capacity, contract value, delivery schedule or the identity of any municipal or industrial buyer. Capacity therefore cannot be converted into plant-sizing units without additional design inputs.
The source does, however, point to a treatment system where increased rainfall may require greater hydraulic and treatment capacity, as well as reliable wastewater operation and maintenance. A conventional treatment train for a project of this class would normally be assessed from screening, primary clarification and biological treatment through tertiary treatment or disinfection; the appropriate biological process and any dissolved-air flotation, zero-liquid-discharge or reuse requirements would depend on the untreated wastewater, discharge standard and site constraints. The reported India initiative bears most directly on wastewater-system capacity and environmental monitoring rather than a disclosed equipment award.
If your plant looks like a wastewater facility receiving higher inflows, facing tighter effluent-quality requirements or needing stronger operation and maintenance support, this is what it means for you: Hiyoshi is positioning environmental monitoring, water treatment and sewage-system capacity as an integrated international offering. Operators evaluating Municipal systems can compare that broader scope with their own treatment and control requirements. Suppliers offering a coordinated Integrated Sewage Treatment proposition should be ready to document how monitoring, hydraulic response and treatment performance fit the buyer’s site. Additional context on treatment-selection issues is available in DAF vs. Clarifier for Mining Wastewater in Milan, 2026.
For a municipal buyer, the immediate procurement questions are therefore the design flow, current and forecast influent quality, receiving-water constraints, required reuse or discharge outcome, and the balance between added treatment capacity and operational monitoring. The report does not provide the values needed to turn the expansion signal into a defensible equipment specification.
FAQ
What capacity would the Hiyoshi project in India have?
The project scale was not reported. Asianet Newsable did not provide design flow in cubic metres per day, population equivalent, treatment capacity or contract value, so operators cannot yet compare the proposal against a specific plant size. Those inputs would be needed to define screening, biological treatment, tertiary treatment and any reuse or discharge stages Asianet Newsable.
How long would delivery and commissioning take?
No delivery or commissioning timetable was reported. The article says Hiyoshi wants to transfer its environmental-protection technology to India and identifies greater water and sewage-system capacity as necessary, but it gives no site, financing arrangement, procurement stage or implementation schedule Asianet Newsable.
What should buyers assess when selecting an environmental-technology partner?
Buyers should ask for demonstrated operation and maintenance experience, water-quality monitoring capabilities and evidence that the proposed treatment train fits the required flow, influent characteristics and discharge or reuse standard. Hiyoshi’s reported experience includes wastewater operation and maintenance, water and sewage analysis, and septic-tank management, although the report does not give technical performance data for a particular treatment process Asianet Newsable.
Will Hiyoshi provide equipment or only environmental services?
The report does not specify the commercial scope. It describes Hiyoshi’s historical work in wastewater treatment, analysis, monitoring and septic-tank management, and states that the company wants to transmit environmental-protection technology to India; however, it gives no equipment list, design standard, local-partner model or procurement route Asianet Newsable.
