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Design Example: Designing a Residential Plumbing System01:25

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Updated: Sep 28, 2025

Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
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Water conservation through plumbing and nudging.

Sumit Agarwal1, Eduardo Araral2,3, Mingxuan Fan4

  • 1Department of Finance, NUS Business School, National University of Singapore, Singapore, Singapore.

Nature Human Behaviour
|April 1, 2022
PubMed
Summary

Upgrading plumbing infrastructure significantly cuts urban water use by 3.5% for over ten years. Peer-comparison nudging programs, however, showed no impact on residential water conservation efforts.

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Area of Science:

  • Environmental science
  • Urban planning
  • Behavioral economics

Background:

  • Urban water security is a growing global challenge.
  • Effective conservation strategies are crucial for sustainable water management.
  • Two common approaches include infrastructure improvements (plumbing) and behavioral interventions (nudging).

Purpose of the Study:

  • To evaluate the long-term effectiveness of plumbing efficiency upgrades on residential water consumption.
  • To assess the impact of a nationwide peer-comparison nudging program on water conservation.
  • To compare the efficacy of plumbing interventions versus nudging strategies in urban water management.

Main Methods:

  • Utilized anonymized monthly billing data from 1.5 million Singaporean accounts over ten years.
  • Employed staggered difference-in-differences (DID) estimation to analyze the impact of a Home Improvement Programme.
  • Conducted an evaluation of a nationwide peer-comparison nudging program.

Main Results:

  • Nationwide plumbing efficiency improvements reduced residential water consumption by 3.5%.
  • This water-saving effect persisted for over a decade and was consistent across demographic groups.
  • The peer-comparison nudging program demonstrated no statistically significant reduction in water consumption.
  • While direct utility bill savings were modest, increased housing value offset the costs of plumbing upgrades.

Conclusions:

  • Plumbing efficiency improvements offer a durable and effective solution for urban water conservation.
  • Behavioral nudging, in the form evaluated, was not effective in reducing residential water consumption.
  • Infrastructure-based water conservation strategies show greater long-term promise than simple behavioral interventions.