What should I do when household tap water suddenly changes color?

Start by recording the change and checking your water utility’s current guidance. Don’t treat color alone as proof of either a particular cause or safety: the EPA source specifically says appearance alone does not establish why the water changed or whether it is safe. [S1]

Write down when you first noticed it, which taps or other outlets you checked, and what you observed at each. Then look for a current notice from your water utility or contact it directly. EPA advises customers who think their water may be contaminated to contact the water company when the system has not issued an advisory; during an advisory, follow the water system’s instructions. [S1]

Keep it observational and brief. Record the date and approximate time, the affected address as a placeholder in your draft, and the outlets you checked—for example, kitchen sink and upstairs bathroom sink. Note whether the change appeared at one outlet or several, and describe the appearance in ordinary words without assigning a cause.

If you can, record whether the appearance seemed different at different outlets or at different times. Those are observations for the utility to assess, not a diagnosis. Don’t delay checking the utility’s current instructions while trying to build a complete record.

Use the water utility’s current notice or direct guidance rather than a general guess based on appearance. EPA says that, during an advisory, customers should follow the water system’s instructions. The utility should state any restrictions and any flushing it requires after an advisory is lifted. [S1]

If there is no advisory, but you think the water may be contaminated, EPA advises contacting the water company. [S1] Ask what instructions apply to your address and whether there is a current notice. The supplied EPA information does not determine the cause or safety of a particular household’s color change, and it does not provide location-specific instructions; those need to come from your utility.

Use this template and replace the bracketed fields. Keep the description factual; leave cause and safety conclusions to the utility.

Water-utility report Date and time first noticed: [date and approximate time] Service address: [address] Affected outlets checked: [list each outlet] What I observed: [plain-language description] When I checked: [times, if checked more than once] Current utility notice checked: [where or when checked, if applicable]

Questions for the utility:

1. Is there a current advisory or other instruction for [service address]?
2. What should household members do while I await further guidance?
3. Do you need any more observations or details from me?
4. If an advisory applies, where can I find its complete instructions, including any restrictions or actions required after it is lifted?

Example wording: “At about [time] on [date], I noticed [description] at the [outlet]. I also checked [other outlets] and observed [what I saw]. Please tell me whether any current guidance applies to [service address] and what steps you want me to follow.”