How Much Water Does a Dishwasher Use? Gallons per Cycle, 1988 to 2027

This month in brief

• The median ENERGY STAR standard-size dishwasher listed for the US is rated at 3.2 gallons per cycle; the 10th percentile is 2.88 gallons and only 17.6 percent of 670 listings are rated under 3.0 gallons (EPA data, October 2026).
• 59.9 percent of those listings sit at exactly 3.2 gallons, the ENERGY STAR v7.0 ceiling, and 18 of 41 brands with five or more listings rate every model at 3.2.
• The federal standard-size cap has been 5.0 gallons since May 30 2013 and is scheduled to fall to 3.3 gallons on April 23 2027, a 49.2 percent cut from the first 6.5 gallon cap of 2010.
• On May 16 2025 DOE proposed rescinding every DOE dishwasher water limit, which would return the cap to the 6.5 gallon statutory level; no final rule had been published by October 27 2026.
• Metered homes in the Water Research Foundation REU2016 study averaged 6.1 gallons per load in 2010 to 2013, 1.91 times today's median certified rating.
• In 2024, 19.3 percent of US homes with a dishwasher did not use it in a typical week, and 65.7 percent ran it three or fewer times a week (EIA RECS, preliminary).
• In measured lab trials, washing a full load by hand used 49 liters (12.9 gallons) in the UK against 13 liters (3.4 gallons) for a dishwasher; country averages ranged from 9.2 to 42.3 gallons.

How much water does a dishwasher use? 3.2 gallons for the median certified model, 2.0 for compacts

Today's answer comes from the ratings of the 670 standard-size and 31 compact ENERGY STAR dishwashers listed for the US market. Ratings come from the DOE normal-cycle test, not from a kitchen.

The ENERGY STAR certified dishwasher list downloaded on 2026-10-27 holds 762 listings. After dropping 40 Canada-only listings and 21 duplicate brand-model rows, 670 standard-size and 31 compact listings remain for the US market.

The median standard-size listing is rated at 3.2 gallons per cycle. The 10th percentile is 2.88 gallons and the 90th percentile is 3.2 gallons. The mean is 3.07 gallons.

The median compact listing is rated at 2.0 gallons per cycle, and the compact range runs from 1.0 to 2.0 gallons. Compact means a capacity under eight place settings plus six serving pieces, per 10 CFR 430.32(f).

Gallons per cycle: Water used in one run of the normal cycle on the DOE test procedure, the figure printed on the EnergyGuide label and reported to ENERGY STAR. Heavy, sanitize and express cycles can use more.

These are ENERGY STAR models only. Non-certified models may legally use up to 5.0 gallons. The DOE Compliance Certification Database, which lists every model sold, refused automated access during this research, so the full market distribution could not be computed (see methodology).

Fitting a dishwasher into existing cabinets is a layout question covered in cabinet refacing vs replacing; the remodel cost calculator estimates the wider kitchen project.

From no limit in 1988 to 3.3 gallons in 2027: every federal and ENERGY STAR cap

No federal rule capped dishwasher water before 2010. Congress set 6.5 gallons, DOE cut it to 5.0 in 2013 and to 3.3 for 2027, while ENERGY STAR moved ahead of each federal step.

The first federal dishwasher rule, from January 1 1988, only required an option to dry without heat. The 1994 standard set an energy factor of 0.46 cycles per kWh for standard models and 0.62 for compacts, with no water term, per the 2009 CFR edition.

The Energy Independence and Security Act of 2007 wrote the first water cap into law: 6.5 gallons for standard-size and 4.5 gallons for compact dishwashers made from January 1 2010. A 2012 DOE direct final rule cut those to 5.0 and 3.5 gallons from May 30 2013.

The 2024 direct final rule set 3.3 gallons (standard-size) and 3.1 gallons (compact) for units made on or after April 23 2027. DOE confirmed that compliance date in October 2024.

Six in ten certified models sit exactly on the 3.2 gallon ENERGY STAR ceiling

The certified market is not spread evenly below the limit. It piles up on it.

Of 670 US standard-size ENERGY STAR listings, 401 are rated at exactly 3.2 gallons, which is 59.9 percent. ENERGY STAR v7.0 allows at most 3.2 gallons, per the ENERGY STAR key product criteria.

Among the 41 brands with five or more US standard-size listings, 18 rate every listing at 3.2 gallons. Listings that also meet ENERGY STAR Most Efficient 2025 have a median of 2.9 gallons across 102 listings.

Every ENERGY STAR standard-size listing is already at or under the 3.3 gallon federal limit due in 2027. DOE's own 2024 analysis found 16 of 19 manufacturers of standard-size models already offered products at the adopted level.

The 2027 limit is on the books, but DOE has proposed scrapping water caps altogether

Two federal tracks point in opposite directions: a finalized 3.3 gallon limit for 2027 and a pending proposal to return to 6.5 gallons.

On May 16 2025 DOE proposed to rescind the dishwasher water limits in 10 CFR 430.32(f), which would restore the 6.5 gallon (standard) and 4.5 gallon (compact) levels in the statute. DOE gave three reasons: doubt about its authority to regulate dishwasher water, a tentative finding that the limits are not economically justified, and a policy of cutting regulation not required by statute.

The proposal cites the Fifth Circuit's 2024 decision in Louisiana v. DOE. Comments closed July 15 2025. A Federal Register search through October 27 2026 found no final rule, and the eCFR text as of October 23 2026 still lists the 2027 limits.

If the proposal is finalized, the legal ceiling for a standard-size dishwasher would rise from 5.0 to 6.5 gallons. The certified models above already rate far below both. Whether any non-certified models would be designed to use more water cannot be seen in the ENERGY STAR data used here.

Meters in real homes logged 6.1 gallons a load, nearly twice today's ratings

Ratings and field use are different numbers. The only large US metered study predates most current models.

The Water Research Foundation REU2016 executive report logged water use in homes served by 23 utilities between 2010 and 2013. Dishwashers averaged 6.1 gallons per load, down 39 percent from 10.0 gallons in the 1999 study.

Dishwashers were the smallest indoor end use at 1.6 gallons per household per day, about 1 percent of indoor use. An automatic dishwasher was present in 84 percent of the study homes.

The metered 6.1 gallons is 1.91 times the current median certified rating. The gap mixes two effects: many study homes had machines built before the 2013 cap, and real loads include heavier cycles than the test's normal cycle. An open-access 2024 Australian study found that the express modifier alone added 25 percent to water per cycle.

For whole-house and per-person totals, see the average water usage per person report; showers and faucets are covered in how much water a shower uses.

Most owners run fewer loads than the 184 a year that the test assumes

Annual ratings multiply per-cycle results by a fixed cycle count. Survey data show most households run fewer loads, and one in five run none.

The DOE test procedure assumed 322 cycles a year until 2001, then 264, then 215 from 2003. The current appendix C2 uses 184, matching the AHAM DW-1-2020 industry value.

In the EIA 2024 RECS, 99.47 million of 132.54 million US homes had a dishwasher, or 75.0 percent. Of those owners, 19.3 percent used it zero times a week and 65.7 percent ran it three or fewer times a week, which is fewer than 184 loads a year.

The 2020 microdata allow a finer cut. Across all owners the weighted mean was 3.06 loads a week, or 159 a year. Owners who used the machine at all averaged 197 a year, the same figure DOE derived from RECS 2020 in its 2023 proposal.

Household size drives frequency: single-person homes reported 1.74 loads a week and four-person homes 4.2 loads a week in 2020.

A year of dishwashing takes 589 to 1,196 gallons depending on which cap the machine was built to

Multiplying each per-cycle limit by the test's 184 loads gives the annual water each rule allows.

At 184 loads, the median certified model uses 588.8 gallons a year. A machine at the 2013 cap uses 920 gallons, and one at the 2010 cap 1,196 gallons. The difference between the 2010 cap and today's median model is 607.2 gallons a year.

Over DOE's 15.2-year average life, a median certified model uses about 8,950 gallons at 184 loads a year. In 2024, 11.8 percent of US dishwashers were 15 or more years old, old enough that most were built before the first federal cap took effect in 2010.

What that water costs depends on local rates; see the average water bill report. Hardness also affects detergent and spotting; see the hard water map.

Hand washing used 3.8 times more water than a dishwasher in a measured UK trial

Two peer-reviewed lab studies measured hand washing directly. Both found more water by hand, with wide spread between people.

In a UK study of 150 participants, washing a full standard load by hand used an average 49 liters of water and 1.7 kWh. The best-selling UK dishwasher of 2007 used 13 liters and 1.3 kWh for the same dishes. Hand washing took 60 minutes against 9 minutes to load and unload.

A 29-country study of 289 participants found country averages from 34.7 to 160.1 liters per 12 place-setting load, and individual results from 18.3 to 472.8 liters.

Even the lowest country average, 9.2 gallons, is 2.9 times the median US certified rating. These were European test loads in a lab, not US kitchens. No US measured study of hand washing was found.

Momentum and share analysis

Download the calculations (CSV)

Findings to track

1. The median ENERGY STAR standard-size dishwasher listed for the US market is rated at 3.2 gallons per cycle, with a mean of 3.07 gallons across 670 listings (October 2026).^[16]
2. 59.9 percent of US standard-size ENERGY STAR listings (401 of 670) are rated at exactly 3.2 gallons, the program ceiling (October 2026).^[16][17]
3. Only 17.6 percent of US standard-size ENERGY STAR listings (118) are rated under 3.0 gallons per cycle; the lowest rating is 2.3 gallons (October 2026).^[16]
4. The median US-listed compact ENERGY STAR dishwasher is rated at 2.0 gallons per cycle, 31 listings, October 2026.^[16]
5. Federal law set the first US dishwasher water cap at 6.5 gallons per cycle (standard-size) and 4.5 gallons (compact) for units made from January 1 2010.^[15][12]
6. Since May 30 2013 the US federal cap has been 5.0 gallons per cycle for standard-size and 3.5 gallons for compact dishwashers.^[1][5]
7. US dishwashers made on or after April 23 2027 may use at most 3.3 gallons (standard-size) or 3.1 gallons (compact) per cycle under the 2024 rule.^[1][3][4]
8. DOE proposed on May 16 2025 to rescind its dishwasher water limits, returning the US cap to 6.5 gallons (standard) and 4.5 gallons (compact).^[2]
9. US homes metered in 2010 to 2013 used an average 6.1 gallons per dishwasher load, down 39 percent from 10.0 gallons in the 1999 study.^[22]
10. Dishwashers accounted for 1.6 gallons per household per day, about 1 percent of indoor use, in the 23-utility REU2016 sample.^[22]
11. In 2024, 75.0 percent of US homes had a dishwasher, and 19.3 percent of those homes used it zero times in a typical week (EIA, preliminary).^[29]
12. US dishwasher owners who used the machine at all ran a mean 197 loads a year in 2020, matching DOE's own RECS-based estimate.^[20][3]
13. UK consumers in a 150-person lab trial used 49 liters to wash a full load by hand, against 13 liters for a dishwasher (published 2010).^[23]
14. DOE estimates the average US dishwasher lasts 15.2 years.^[3]

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Reproduce this analysis

Every figure comes from the files below. The scripts that pulled and computed them are kept with the report and can be re-run.

Data quality and exclusions

• Removed 40 ENERGY STAR listings sold only in Canada (762 to 722).
• Removed 21 duplicate brand-model rows that repeated identical listings (722 to 701); this moved the 10th percentile from 2.66 to 2.88 gallons.
• RECS 2020: 114 of 14,108 dishwasher households had an imputed weekly-use value; they were kept, as EIA's weights assume.
• RECS 2024 frequency bands (0, 1, 2 to 3, 4 to 6, 7 or more) were matched by regrouping the 2020 microdata into the same bands.
• REU2016 executive report text was taken from a copy filed with the California State Water Resources Control Board because waterrf.org refused automated access.

Methodology

Selection: federal limits come only from statute (42 U.S.C. 6295), the Code of Federal Regulations (current eCFR and annual GPO editions) and DOE rules in the Federal Register. ENERGY STAR limits come from EPA program documents. Model ratings come from the EPA ENERGY STAR certified dishwasher dataset. Household use comes from EIA RECS 2020 microdata and the preliminary RECS 2024 table HC3.1. Field water use comes from the Water Research Foundation REU2016 executive report. Hand washing figures come only from peer-reviewed measured studies.

Inclusion and exclusion: of 762 ENERGY STAR listings, 40 Canada-only listings and 21 duplicate brand-model rows were removed, leaving 670 standard-size and 31 compact US listings. Retailer and manufacturer blogs, and hand washing estimates without a measured basis, were excluded.

Conflicts: where a rating and a metered figure differ, both are shown with their period and basis. ENERGY STAR's consumer page claims about 5,800 gallons saved over a lifetime and 8,400 gallons a year vs hand washing; these agency estimates do not show their assumptions on the page and are not used in calculations.

Derived metrics: all formulas and inputs are in derived_metrics.csv and scripts/analyze.py. RECS 2020 estimates use the final weight NWEIGHT with standard errors from the 60 replicate weights (Fay's method, factor 4/60). Liters are converted at 3.785412 per US gallon (NIST).

Limitations: the DOE Compliance Certification Database refused automated access (HTTP 403) and an Internet Archive copy was unavailable at the time, so the distribution covers ENERGY STAR models only. REU2016 covers 23 utilities, not a national sample, and predates most current models.

Last update: 2026-10-27. The ENERGY STAR list, Federal Register and eCFR will be rechecked when DOE acts on the 2025 proposal or when EIA releases full 2024 RECS data.

This report presents published data with its limitations. It is not legal, financial or investment advice.

Sources, ranked by quality

Tier 1: primary and official sources (28)

• [1] Office of the Federal Register, eCFR. 10 CFR 430.32(f), Energy and water conservation standards: dishwashers (eCFR, up to date as of 2026-10-23). current. Accessed 2026-10-27.
• [2] U.S. Department of Energy. Rescinding the Amended Water Use Standards for Residential Dishwashers (proposed rule, 90 FR 20859). 2025-05-16. Accessed 2026-10-27.
• [3] U.S. Department of Energy. Energy Conservation Standards for Dishwashers (direct final rule, 89 FR 31398). 2024-04-24. Accessed 2026-10-27.
• [4] U.S. Department of Energy. Energy Conservation Standards for Dishwashers: confirmation of effective and compliance dates (89 FR 83611). 2024-10-17. Accessed 2026-10-27.
• [5] U.S. Department of Energy. Energy Conservation Standards for Residential Dishwashers (direct final rule, 77 FR 31918). 2012-05-30. Accessed 2026-10-27.
• [6] U.S. Department of Energy. Energy Conservation Standards for Dishwashers: confirmation of effective date (77 FR 59712). 2012-10-01. Accessed 2026-10-27.
• [7] U.S. Department of Energy. Energy Conservation Standards for Residential Dishwashers: final determination (81 FR 90072). 2016-12-13. Accessed 2026-10-27.
• [8] U.S. Department of Energy. Establishment of a New Product Class for Residential Dishwashers (85 FR 68723). 2020-10-30. Accessed 2026-10-27.
• [9] U.S. Department of Energy. Product Classes for Residential Dishwashers, Residential Clothes Washers, and Consumer Clothes Dryers (87 FR 2673). 2022-01-19. Accessed 2026-10-27.
• [10] U.S. Department of Energy. Energy Conservation Standards for Dishwashers, Residential Clothes Washers, and Consumer Clothes Dryers (89 FR 105408). 2024-12-27. Accessed 2026-10-27.
• [11] U.S. Department of Energy. Test Procedure for Dishwashers (final rule, 88 FR 3234). 2023-01-18. Accessed 2026-10-27.
• [12] U.S. Department of Energy. Energy Conservation Standards for Certain Consumer Products (Dishwashers, Dehumidifiers, …), 74 FR 16040. 2009-04-08. Accessed 2026-10-27.
• [13] U.S. Government Publishing Office. 10 CFR 430.32, 2009 annual edition. edition of 2009-01-01. Accessed 2026-10-27.
• [14] U.S. Government Publishing Office. 10 CFR 430.32, 2011 annual edition. edition of 2011-01-01. Accessed 2026-10-27.
• [15] U.S. Government Publishing Office. 42 U.S.C. 6295, Energy conservation standards (U.S. Code 2023 edition). 2023 edition. Accessed 2026-10-27.
• [16] U.S. EPA ENERGY STAR. ENERGY STAR Certified Residential Dishwashers (dataset q8py-6w3f). snapshot 2026-10-27. Accessed 2026-10-27.
• [17] U.S. EPA ENERGY STAR. Dishwashers Key Product Criteria. Version 7.0, effective 2023-07-19. Accessed 2026-10-27.
• [18] U.S. EPA ENERGY STAR. ENERGY STAR Program Requirements for Residential Dishwashers, Version 6.0. effective 2016-01-29. Accessed 2026-10-27.
• [19] U.S. EPA ENERGY STAR. ENERGY STAR Dishwashers (consumer page). page as of 2026-10-27. Accessed 2026-10-27.
• [20] U.S. Energy Information Administration. Residential Energy Consumption Survey 2020, public microdata v7. 2020 (released January 2024). Accessed 2026-10-27.
• [21] U.S. Energy Information Administration. Electric Power Monthly, Table 5.3: average price of electricity by sector. through August 2026. Accessed 2026-10-27.
• [23] Wiley. Manual dishwashing habits: an empirical analysis of UK consumers (Berkholz et al., International Journal of Consumer Studies). published 2010. Accessed 2026-10-27.
• [24] Wiley. Comparative analysis of global consumer behaviour in the context of different manual dishwashing methods (Berkholz, Kobersky, Stamminger). published 2011. Accessed 2026-10-27.
• [25] Springer. Understanding consumers' behaviour … automatic dishwashing: an Australian household investigation (Alt and Stamminger, Energy Efficiency 17:104). published December 2024. Accessed 2026-10-27.
• [26] National Institute of Standards and Technology. NIST Guide to the SI, Appendix B.9: conversion factors. current. Accessed 2026-10-27.
• [27] Office of the Federal Register. Federal Register document search: dishwasher, 2025-01-01 to 2026-10-27. searched 2026-10-27. Accessed 2026-10-27.
• [28] De Gruyter. What science knows about our daily dishwashing routine (Schencking and Stamminger, Tenside Surfactants Detergents). published 2022-03-14. Accessed 2026-10-27.
• [29] U.S. Energy Information Administration. RECS 2024 Table HC3.1, Appliances in U.S. homes by housing unit type (preliminary). released March 2026. Accessed 2026-10-27.

Tier 2: trade bodies, market research, company data (1)

• [22] Water Research Foundation. Residential End Uses of Water, Version 2: Executive Report (copy filed as exhibit NRDC-10 with the California State Water Resources Control Board). 2010 to 2013 data, published April 2016. Accessed 2026-10-27.