For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.
Water Works Bureau Customer Service Center
Phone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.
Here's the text.
Environmental Accounting
Last update date April 12, 2024
Environmental Accounting [Financial Results for FY2022]
"Environmental accounting" is a mechanism that quantifies and announces how much cost has been invested and how much effect has been obtained for environmental conservation initiatives such as global warming countermeasures. (Aggregation scope: water supply business and industrial water supply business).
Environmental conservation costs (costs in environmental conservation initiatives) [5,037.51 million yen (FY2022)] (3,794,160,000 yen (FY2021))
Investments in the construction of facilities and equipment for environmental measures totaled 1,528,510,000 yen, and the cost of maintenance and management of the facilities was 3,509 million yen. This represents approximately 4% of Water Works Bureau's fiscal 2022 expenditure (approximately 120 billion yen).
The main components of investment are: Pollution prevention costs for redevelopment of water purification plants, etc. 1 Pollution prevention costs of 815,230,000 yen, and replacement of power-saving pump facilities, etc. 2 Global environmental conservation costs.
The main components of the cost are: Pollution prevention cost of wastewater sludge treatment at water treatment plants is 819.42 million yen, environmental improvement of dam lakes, etc. 2 Global environmental conservation costs of 814.92 million yen, and recycling of construction waste. 3.
| Classification | Major Initiatives | Investments (Thousands of yen) | Costs (Thousands of yen) | |
|---|---|---|---|---|
| （１） Costs within business area | Costs incurred by Water Works Bureau's business activities, from water sources to faucets | 1,528,506 | 3,272,184 | |
Inside Translation | ①Pollution prevention costs | Redevelopment project at Nishiya Water Purification Plant and Wastewater Sludge Treatment Plant | 815,227 | 819,416 |
| ②Global Environment conservation Costs | Renewal of power-saving pump equipment, improvement of dam lake environment, management of watershed forests, etc. | 523,208 | 814,922 | |
| ③Resource recycling costs | Purchasing recycled water meters, recycling of construction waste, waste disposal, water leakage prevention measures, etc. | 190,071 | 1,637,846 | |
| （２） Cost of management activities | Commissioning of weeding work, publicizing water supply business, etc. | 0 | 229,290 | |
| （３） Cost of social activities | PR of water source forests, subsidies for volunteers in Doshi water source forest | 0 | 7,530 | |
| Total | 1,528,506 | 3,509,004 | ||
Environmental conservation effects (effects to prevent the occurrence of environmental impact) [17,563 t-CO2 (FY2022)] (18,000 tons-CO2 (FY2021)))
As a result of efforts to protect the environment, such as the use of power-saving equipment and the management of watershed forests, the reduction of 17,563 tons in terms of carbon dioxide (CO2) emissions.
This is equivalent to the amount of CO2 emitted by 6,834 households (annotations) in one year. In addition, 151,652 tons of debris generated during construction were recycled, and 321,486 tons of recycled materials were used as construction materials, making it more effective.
Note: Annual CO2 emissions per household 2.57 tons (based on the Ministry of the Environment's “Summary of Survey on CO2 Emissions in the Household Sector (Preliminary figures)”)
| Effects of greenhouse gas reduction | Unit: t-CO2 | |
|---|---|---|
| ①Due to the introduction of equipment Effects of reducing environmental impact substances | Amount to be prevented by the use of power-saving equipment (Power saving pump, small hydroelectric power generation, solar power generation) | 2,826 |
| ②Business Activities Accompanying conservation Effect | Amount to be prevented from leaking water | 161 |
| Amount absorbed by watershed forests | 14,576 | |
| Total reduction amount | 17,563 | |
| Effective utilization of resources | Unit: t | ||
|---|---|---|---|
| ③Effective utilization of resources | Recycling of debris | Asphalt | 139,792 |
| Concrete | 11,860 | ||
| Use of recycled materials | Recycled asphalt | 130,019 | |
| Reclaimed crushed stone | 191,467 | ||
Economic benefits (revenues from environmental conservation measures and cost reduction) [616,640,000 yen (FY2022)] (¥1,773.02 million (FY2021))
As a result of environmental conservation efforts, the total amount of revenue and cost reduction was 616,640,000 yen.
Revenues amounted to 158.23 million yen for waste recycling, such as the sale of water meters, and 38.08 million yen for the sale of small hydropower and solar power generation.
Cost reduction amounted to 291.47 million yen for the use of recycled materials in construction and 121.28 million yen for the use of power-saving equipment.
| Details of economic effects | Unit: Thousand yen | |
|---|---|---|
| Revenues | Waste recycling | 158,225 |
| Sales of small hydroelectric power generation and solar power generation | 38,075 | |
| Subtotal | 196,300 | |
| Cost reduction | Use of recycled materials and reuse of generated soil in construction | 291,467 |
| Utilization of power-saving equipment (power-saving pumps, small hydroelectric power, solar power generation) | 121,281 | |
| Water leakage prevention | 7,593 | |
| Subtotal | 420,341 | |
| Total | 616,641 | |
Environmental burden until delivery of tap water
To deliver safe and high quality water, Water Works Bureau consumes a lot of energy, including electricity, and emits greenhouse gases such as CO2.
Tables 5 and 6 show the energy resources (= input) and the substances discharged (= output) that were consumed before water is delivered using dams and rivers as water sources.
| Energy and resources consumed (input) | |||
|---|---|---|---|
❶Water intake and water transmission | ❹Water Purification | ❺Water supply and distribution | Total amount of input |
| <Energy> Power: 21,249 thousand kWh Fuel: 3,825ℓ Gas: 373m3 [Resources] Chemicals: 253t | <Energy> Power: 71,805 thousand kWh Fuel: 27,259ℓ Gas: 2,449m3 [Resources] Chemicals: 11,680t | <Energy> | <Energy> Power: 131,187 thousand kWh Fuel: 139,841ℓ Gas: 69,014m3 [Resources] Chemicals: 11,933t |
- Power is primarily used as power for pump equipment. Yokohama City uses 173 pumps to send water to high altitude areas due to the rugged terrain and draws the Banyu River system, one of the water sources, from the downstream of the Sagami River. I am.
- Fuel and gas are used in public vehicles and the operations of each business site.
- Chemicals (such as sodium hypochlorite) are mainly used in water purification plants to remove and disinfect impurities contained in raw water.
- Power consumption per 1m3 of tap water will be 0.32kWh (only for water supply business).
| Substances (output) | |||
|---|---|---|---|
| ❶Water intake and water transmission | ❹Water Purification | ❺Water supply and distribution | Total output |
<Greenhouse gas> | <Greenhouse gas> | <Greenhouse gas> | <Greenhouse gas> 59,867t-CO2 [Waste] Water purification treatment soil 3,746t Water supply construction soil 204,910t |
- More than 90% of greenhouse gases emitted by Water Works Bureau are electricity consumption.
- Greenhouse gas emissions are calculated based on the "Emission Coefficient by Electric Power Companies" published by the Ministry of the Environment and the Ministry of Economy, Trade and Industry.
- The publication is based on the "Environmental Accounting Guidelines 2005 Edition" published by the Ministry of the Environment.
Environmental Initiatives
Please refer to this file for more information about Water Works Bureau's environmental initiatives.
•Water Works Bureau and the Environment <Environmental Initiatives> (PDF: 943KB)
<Previous years>
Financial Results for FY2021
•Water Works Bureau and the Environment <Environmental Initiatives> (PDF: 7,148KB)
•Water Works Bureau and the Environment (Environmental Accounting) (PDF: 1,059KB)
[Financial Results for FY2020]
•Water Works Bureau and the Environment <Environmental Initiatives> (PDF: 937KB)
•Water Works Bureau and the Environment (Environmental Accounting) (PDF: 903KB)
In order to open PDF files, you may need a separate PDF reader.
If you do not have it, you can download it free of charge from Adobe.
To download Adobe Acrobat Reader DC
For inquiries to this page
Water Works Bureau, Corporate Planning Division
Phone: 045-671-4887
Phone: 045-671-4887
Fax: 045-212-1157
Email address: su-keieikikaku@city.yokohama.jp
Page ID: 432-288-787
