Shower Water Temperature and Quality: What the Sources Say

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What temperature should shower water be? For scald safety, the government sources we opened point to 120 degrees Fahrenheit or lower at the tap. The Washington State Department of Social and Health Services bulletin says hot water should be between 105 and 120 degrees, and a U.S. Department of Veterans Affairs directive says 110 degrees at the outlet minimizes the risk of scalding for most adults. Neither source gives a comfort temperature, and neither says a shower head or shower filter changes water quality.

Quick answer

• Scald safety: keep hot water at the tap at or below 120 degrees Fahrenheit. The Washington bulletin says hot water should be between 105 and 120 degrees.
• Bathing: the same bulletin gives 100 degrees as a safe bathing temperature, and says cooler for infants or older adults.
• Legionella: the VA directive says 124 degrees Fahrenheit or higher is necessary to inhibit Legionella growth in hot water systems. It is written for VA buildings, not homes, so it is not a home setting.
• Utility water: your utility should send a consumer confidence report each year. Well water should be tested periodically by a state-certified lab.
• Purification: none of the sources we opened says a shower head or shower filter purifies water.

What temperature should shower water be

The sources give scald thresholds and one building-system figure for Legionella. They do not give a comfort or ideal shower temperature.

Scald thresholds from the sources

The Washington State bulletin, titled “How hot is the hot water in your home?”, says the risk of burns is greatest when water temperature is above 120 degrees. The same bulletin says 140-degree water scalds in just one second, and that it takes four minutes for 120-degree water to scald.

The VA directive gives a related set of figures. It says that at 117 degrees the risk of scalding increases significantly, and that at 140 degrees second-degree burns may occur after only 3 seconds of exposure. It also notes that some people, because of illness, disabilities, extremes of age, or side effects of medication, may be less sensitive to hot water temperatures or may react more slowly.

Bathing and the people at highest risk

The bulletin says children ages 5 and under and older adults are at the highest risk of scalds, and that people who use personal care and bathing help are also at higher risk. It recommends that a person helping someone bathe test the water first by running a hand, wrist, and forearm through it. The water should feel warm, not hot. It also says safe bathing temperature is 100 degrees, and cooler for infants or elderly people.

If you are choosing a setting for a household with children or an older adult, the bulletin’s advice to be cooler for those readers is the point to act on. The bulletin gives the range; it does not say which point in the range suits a given household.

Why building hot water is kept hotter

The VA directive is written for VA healthcare buildings, and it sets a different target for hot water systems. It says water temperatures at 124 degrees Fahrenheit or higher are necessary to inhibit Legionella growth in hot water systems. It then says it is not possible to maintain outlet temperatures that kill Legionella bacteria and also eliminate the possibility of scald injury in persons who are partially or fully insensitive to hot water temperature. For that reason the directive requires mixing valves, or anti-scald devices, at outlets where people use water, including showers. The mixing valves are to be positioned as close to the outlets as possible, and the directive says water should be discharged from outlets at 110 degrees or below.

This is a building rule, not guidance for a home. The sources do not say what a home water heater should be set to for Legionella control, and this post does not suggest a home setting above 120 degrees. If you want a mixing valve in a home, that is plumbing work beyond swapping a head or arm, and it should be installed by a licensed plumber.

How to check the temperature at your own shower

The Washington bulletin describes a simple check with a thermometer that measures liquids. Use no hot water for two hours before you measure. Run the faucet for two to three minutes until hot water comes out, and keep as much of the thermometer probe in the flow as you can. Check every hot water faucet in the home, paying special attention to the ones used by children or by anyone who has trouble regulating water temperature. The bulletin also says readings can differ with the distance from the water heater and with the season, so repeat the check every month or two and save the results.

If any tap reads higher than 120 degrees, the bulletin says to turn down the water heater. It also says to talk to the homeowner, landlord, or manager if you rent. If you cannot reach the thermostat, it says to call the local electric or gas company. Adjusting a water heater is not a shower head job, so anything beyond the thermostat setting belongs to a licensed plumber.

How clean is shower water?

“Clean” can mean two things: the water your utility or well delivers, and what happens to that water between the pipe and the spray. The sources cover the first much more directly than the second.

Water from a public utility

The EPA treatment guide says homes and businesses that get their water from a public water system should receive a consumer confidence report (CCR) from their utility each summer. The CCR contains state-certified lab results that compare the utility’s water quality against the National Primary Drinking Water regulations. As a water utility customer, you have the right to review it, and you can contact your local water supplier if you have not received one.

The EPA drinking water regulations page says the National Primary Drinking Water Regulations are legally enforceable primary standards and treatment techniques that apply to public water systems. That tells you what the standards cover. It does not describe the water after it reaches your fixtures. The sources we opened do not say whether the utility report reflects water quality at your shower head, so read it as a measure of the water entering your home, not of the spray.

If the report lists a contaminant you care about, use it as the starting point for any treatment decision. The guide also says public utility customers who are concerned about water quality can have it tested by a state-certified lab.

Water from a private well

Water from a well is a different case. The EPA treatment guide says homes that receive water from a well should have their water periodically tested by a state-certified lab to assure compliance with national drinking water standards. The guide also points readers to EPA’s private wells page for information on safeguarding and testing well water, and to a list of certified laboratories. A well owner who sees a problem with the shower, such as odor or staining, should test before buying any device, because the test tells you which contaminant the treatment has to target.

Water inside the house

The sources we opened do not give a standard or a test for water at the shower head itself. The VA directive treats showerheads as outlets in a building water system, and it sets the temperature rules described above for those outlets. It does not give a cleaning schedule for a home showerhead or a Legionella risk level for a home shower, and this post does not invent one.

Odor and mineral questions are separate from temperature and filtration. For a smell, see why shower water smells like rotten eggs. For minerals, see how to tell whether your water is hard.

How to improve shower water quality

The sources support one sequence. First find out what your water contains. Then choose a treatment that is certified for the contaminant you found, and use it only on the water it was designed for.

• Read the consumer confidence report from your utility, or the state-certified lab result from your well, and list each contaminant it reports.
• Match each contaminant to a device certification. The EPA guide says certification helps confirm a manufacturer’s claims, and that certifications focus on different contaminants and performance indicators.
• Check the performance data sheet for the specific contaminant you need. The guide says the specific contaminants each system can treat for can vary widely.
• Use point-of-use devices where the water is used for drinking and cooking. The guide says point-of-use devices are best suited for homes or businesses that wish to treat water used for drinking and cooking.
• Avoid oversizing. The guide says larger systems tend to cost more to buy, operate, and maintain, and that many water uses such as flushing toilets and washing clothes do not require additional treatment.
• Replace cartridges on schedule. The guide says filters should be replaced according to the manufacturer’s instructions and recommended schedule.

Point-of-use and whole-house systems

The EPA guide describes point-of-use treatment as water treated at the tap or where it is used, such as a pitcher with a filter, a filter on a dedicated faucet, or a device under the sink. Whole-building systems are different. The guide describes them as distributing treated water throughout a building for all uses, and it lists showering among those uses. That is the only place in the guide where showering appears, and the guide does not describe a shower filter on its own.

Reverse osmosis and water waste

If a device uses reverse osmosis, the EPA guide says the treatment process generates water waste, and that a typical point-of-use RO system generates at least five gallons of waste for every gallon of treated water it produces. The guide also says WaterSense labeled RO systems generate 2.3 gallons of waste or less for every gallon of treated water.

How to purify shower water (and what a shower product cannot do)

No source we opened says that a shower head or a shower filter purifies water, and the sources do not describe shower filters at all. The EPA treatment guide describes point-of-use devices as best suited for water used for drinking and cooking, and it describes certification as covering specific contaminants and performance, not general purity. A shower product does not purify water unless a source you open says the specific product does.

This post does not list shower products. A product claim about one contaminant means something only if a named certification or performance data sheet supports it. For a question about chloramine specifically, see whether a shower filter removes chloramine.

For drinking water, the sources point to a different kind of device: a point-of-use system certified for the contaminant you need, installed where the water is used for drinking and cooking. A device used at the shower is not a substitute for that step.

How we chose

This post uses only government pages that we opened in this session with curl on 2026-10-23. We stripped the HTML from each downloaded page, or extracted the text from each PDF, and checked each quoted sentence against that text before using it. Search results were used only to find candidate pages; no search result is cited as a source. Pages that returned 403 or 404 were not used. Those pages include CDC Legionella and healthy water pages, a DOE water heater page, a CPSC scald page, and an EPA page on basic public water system information. Retailer, product listing, and blog pages were not used for any claim.

Each figure in the post is stated in one of the opened sources. Where a source gives no figure, the post says so.

What we could not verify

What the sources do not say

• No opened source gives a preferred comfort temperature for showering. The figures used here are scald and Legionella thresholds, not a comfort target.
• No opened source says a shower head or shower filter reduces chlorine, metals, or any other contaminant in shower water.
• The VA directive is written for VA buildings. It does not say what a home water heater should be set to for Legionella control.
• No opened source gives a cleaning schedule for a home showerhead, or a Legionella risk level for a home shower.
• The CDC pages on Legionella and water systems returned 403 and could not be opened, so this post does not quote the CDC.
• The NSF/ANSI standards for shower filters are not government documents, and none was opened, so this post does not describe what those standards test.

FAQ

What temperature should shower water be?

Keep hot water at the tap at or below 120 degrees Fahrenheit. The Washington bulletin says hot water should be between 105 and 120 degrees and gives 100 degrees as a safe bathing temperature. The sources do not give a comfort temperature.

Is shower water safe to drink?

The sources do not say that shower water is safe to drink. The EPA guide says point-of-use devices are best suited for water used for drinking and cooking. Check the utility report or well test first, and treat drinking water with a device certified for the contaminant you need.

Does a shower filter purify water?

No source we opened says so. A shower product does not purify water unless a source you open says the specific product does, and the sources here do not describe shower filters.

How do I check the temperature of my shower?

Use a thermometer that measures liquids. Use no hot water for two hours before you measure, run the faucet two to three minutes until hot water comes out, and keep as much of the probe in the flow as you can. Repeat the check every month or two and save the results.

Do I need to test my water?

If your home is on a public water system, read the consumer confidence report your utility sends each year. If your home is on a well, the EPA page says it should be tested periodically by a state-certified lab.

Bottom line

Keep tap water at or below 120 degrees Fahrenheit, check it with a thermometer, and set it lower for young children and older adults. Read your utility report or well test before you buy any device. A shower head or shower filter does not purify water unless a source you open says the specific product does, and drinking water should be treated with a point-of-use device certified for the contaminant you need.

Sources

• Washington State Department of Social and Health Services, “How hot is the hot water in your home?” bulletin, DSHS 22-1939 (8/23). https://www.dshs.wa.gov/sites/default/files/DDA/dda/documents/DDA%20How%20Hot%20is%20the%20Water%20Bulletin%20%28003%29.pdf (opened 2026-10-23). Supports the 105 to 120 degree range, the 120 degree burn threshold, the 100 degree bathing figure, and the thermometer check.
• U.S. Department of Veterans Affairs, VHA Directive 1061, Prevention of Healthcare-Associated Legionella Disease and Scald Injury from Potable Water Distribution Systems (August 13, 2014), as hosted by the New Jersey Department of Health. https://nj.gov/health/cd/documents/topics/Legionnaires’/prevention-legionella-potablewater.pdf (opened 2026-10-23). Supports the 124 degree Legionella figure, the 110 and 117 degree scald figures, and the building mixing valve rule.
• U.S. Environmental Protection Agency, WaterSense Guide to Selecting Water Treatment Systems. https://www.epa.gov/system/files/documents/2025-01/ws-products-home-water-treatment-guide_v2_508.pdf (opened 2026-10-23). Supports the consumer confidence report, well testing, point-of-use, whole-house, certification, maintenance, and RO waste statements.
• U.S. Environmental Protection Agency, “Protect Your Home’s Water” well page. https://www.epa.gov/privatewells/protect-your-homes-water (opened 2026-10-23). Opened and cited only for the guide’s pointer to well water safeguarding and testing information.
• U.S. Environmental Protection Agency, National Primary Drinking Water Regulations. https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations (opened 2026-10-23). Supports the statement that the regulations are legally enforceable standards for public water systems.