Drinking Water

  1. Water Consumption
  2. Water Leakage
SourceWashington Department of Health
Data TablePublic Water System Water Use
ExplanationPublic Water Systems are entities that provide water for human consumption through pipes and pipes or other constructed conveyances. Roughly 75% of Thurston County residents get their water from a public water system. Total water produced by systems remained steady between 2010 to 2014 and increased slightly between 2014 and 2015.

In Washington, public water systems are regulated by the state Department of Health to ensure the water produced is safe to drink. Systems fall into two categories:
  • Group A Systems provide water to at least 15 service connections or serve at least 25 people for at least 60 days a year and are regulated under the federal Safe Drinking Water Act.
  • Group B Systems serve 3 to 14 service connections and less than 25 people per day or serves 25 or more people per day during fewer than 60 days per year and are regulated under state law. 
Public water systems serve "the public" but may be publicly, privately, or cooperatively owned. The Department of Health identifies 7 public water system ownership types:
  • City/town-owned
  • County-owned
  • State-owned
  • Special district-owned, such as Thurston PUD
  • Association-owned, such as a home owners association
  • Investor-owned
  • Privately-owned
City/town owned systems produce about 80% of total water produced, the remaining ownership categories produce less than 5% each.

Larger water systems generally have a lower and more stable leakage rates. Between 2010 and 2015 City/town-owned water systems have maintained a leakage rate of less than 10%. Leakage data is not available for systems that do not have meters for all customers.

Total Water Produced, Authorized Consumption, and Leakage

Total Water Produced − Authorized Consumption = Leakage

Total Water Produced is the amount of water pumped and dispersed from each water system’s source.

Authorized Consumption, is the total amount of water used by customers, based on data from customers' water meters.

Leakage is the difference between Authorized Consumption and Total Water Produced. Leakage is due to several causes, such as leaks in pipes and valves in the water distribution system, storage overflow, and unauthorized or unmetered consumption.

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