Can I just boil the water to make it safe?

Boiling can kill many bacteria, but it does nothing for chemical contamination and can concentrate some contaminants. It is not a universal fix. Use a known-safe source and test for bacteria rather than relying on boiling.

The smell is only from hot taps. Is that less serious?

A hot-only odor often points to the water heater rather than the well, which is usually less urgent. Even so, confirm with a test if you are unsure, because clear-looking water is never proof of safety.

Well Water ProblemsHealth-sensitive topic

Well Water That Smells Like Sewage

A sewage or septic smell can signal bacterial contamination, especially if a septic system or surface water may be reaching the well. Treat it as a possible health issue: stop drinking, use a safe source, and test.

By Know Your Well Water Editorial TeamReviewed October 29, 20262 min read

Quick Answer

A sewage smell in well water can point to bacterial growth in the water heater or plumbing, or more seriously to septic-system or surface-water contamination reaching the well. Because this can be a health issue, stop drinking the water, switch to a safe alternate source, contact your local health department, and test for total coliform and E. coli bacteria before deciding anything else.

Treat a sewage smell as a possible contamination event

Do not assume a sewage odor is cosmetic. Stop drinking and cooking with the water, use bottled or another known-safe source, and contact your local health department. Then test for bacteria. Boiling does not make chemically contaminated water safe and can concentrate some contaminants.

Possible causes

Bacteria growing in the water heater, producing odor at hot taps only.
Bacterial growth or biofilm in the well, plumbing, or fixtures.
Septic system failure or a septic drainfield too close to the well.
Surface water, runoff, or flooding reaching the well through a damaged cap or casing.

Hot-only vs. all taps

If the smell is only at hot taps, the water heater is the likely source. If it is at all taps, including cold, the well or supply is more likely involved and the contamination risk is higher.

What to do

1Stop using the water for drinking, cooking, brushing teeth, and making ice.
2Switch to bottled water or another known-safe supply.
3Contact your local health department for guidance and local risk factors.
4Have the water tested for total coliform and E. coli bacteria at an accredited lab.
5Inspect the well cap, casing, and the distance to the septic system for obvious problems.

When to call a professional

If bacteria are confirmed, a licensed well contractor can disinfect the well and help find how contamination is entering, such as a failed cap, cracked casing, or a septic setback problem. Retest after any disinfection to confirm the water is clear before returning to normal use.

Frequently asked questions

Can I just boil the water to make it safe?: Boiling can kill many bacteria, but it does nothing for chemical contamination and can concentrate some contaminants. It is not a universal fix. Use a known-safe source and test for bacteria rather than relying on boiling.
The smell is only from hot taps. Is that less serious?: A hot-only odor often points to the water heater rather than the well, which is usually less urgent. Even so, confirm with a test if you are unsure, because clear-looking water is never proof of safety.

Sources & references

Private Ground Water Wells — CDC, accessed October 29, 2026
Protect Your Home’s Water: Private Wells — US EPA, accessed October 29, 2026

This guide is documentary research and general information, not a laboratory analysis or professional assessment of your specific well. See our disclaimer.