Bought a House With a Water Well? Here’s What You Need to Know

If you’ve never owned a home with a private water well, it can feel overwhelming. Unlike city water, well water is not treated or routinely tested by a public utility. That responsibility now belongs to you as the homeowner.

The good news: well water can be an excellent source of drinking water when properly maintained and tested. This guide explains whether well water is safe, what to test for, how often to test, and what to do if your water fails.

Is well water safe to drink?

Yes, well water can be safe to drink, but only if it’s properly tested and monitored.

Private wells draw water directly from underground aquifers. Because of this, they are more vulnerable to sudden contamination than municipal water systems. Common risks include:

• Bacteria entering through a cracked well casing
• Flooding that introduces surface contaminants
• Nearby agriculture, septic systems, or industrial activity

Unlike city water, no one is testing your well unless you do. Water quality can change without visible warning, which is why routine testing is essential.

What should you test for in well water?

While there are hundreds of possible contaminants, most well owners should focus on a core set of tests that cover the most common and dangerous risks.

Well water tests should include:

• Bacteria, especially total coliform and E. coli
• Nitrates and nitrites, often linked to fertilizers and septic systems
• Heavy metals, such as lead and arsenic
• Regional contaminants, which vary by location (for example, uranium, manganese, or agricultural chemicals)

A well water test should always include bacteria, inorganic compounds, and metals at a minimum. Additional testing may be recommended based on local geology or land use.

How often should you test your well water?

Well water testing follows two schedules: routine testing and bacteria testing.

Routine well water testing

• Tests for nitrates, metals, and chemical contaminants
• Should be done once per year

Bacteria testing

• Tests for coliform bacteria and E. coli
• Should be done quarterly at a minimum, ideally every other month
• Should also be done:
  • After flooding
  • After well repairs or maintenance
  • If water taste, smell, or appearance changes

Bacteria is often an early warning sign of larger problems with the well. Because bacteria tests are affordable and easy to perform at home, quarterly testing is one of the simplest ways to protect your water supply.

What to do if your well water fails a test

If your well water test shows contamination, there is a clear and practical path forward.

If bacteria is detected:

1. Inspect the well head, cap, and seal for visible damage
2. Perform shock chlorination to disinfect the well
3. Retest after treatment to confirm results

If bacteria returns after shock chlorination, a licensed well contractor should inspect the well for structural issues.

If non-bacterial contaminants are found:

• Contaminants like arsenic, lead, or chemicals typically require filtration or treatment systems
• Always share your lab results with a filtration professional
• Make sure the system is specifically certified for the contaminants detected

Treatment solutions should always be based on actual test results, not guesswork.

Getting started with well water testing

If you’re ready to start testing your well water, using a structured testing bundle can simplify the process.

• Our Essentials Bundle includes everything you need for routine well water testing using DIY tests at a great value.
• Our Well Water Bundle combines laboratory testing with enough bacteria tests to cover an entire year.

Many well owners also benefit from a well water owner’s guide that explains testing, maintenance, and treatment options in more detail.

 

Key Takeaways

Well water can be safe to drink, but it must be tested regularly. Annual routine testing and quarterly bacteria testing are essential for protecting your household.