Recent water testing in Rexburg, Idaho has returned Radium readings above detection thresholds.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

Radium in Rexburg Tap Water

Radium has been detected in Rexburg, Idaho drinking water at a maximum level of 9.333 pCi/L — 1.87x the EPA MCL.

This analysis covers 41,496 residents across 3 ZIP codes in Rexburg.

Rexburg's overall water quality grade is C (66/100).

Is Radium in Rexburg Water Safe?

Radium was detected in Rexburg water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.

If you are concerned, a reverse osmosis or ion exchange filter can reduce radium levels further.

Radium Levels by ZIP Code

Average radium level across Rexburg: 9.33 pCi/L

Health Effects of Radium

• Increased risk of bone cancer (radium accumulates in bones)
• The body treats radium like calcium, storing it in bones
• Lifetime cancer risk of ~1 in 10,000 at 5 pCi/L
• No safe threshold for radioactive contamination

Health risk severity: High. Governed by the Radionuclides Rule.

How Radium Gets Into Drinking Water

• Natural radioactive decay in underground rock formations
• Groundwater sources (especially deep wells)
• Mining and industrial waste
• Higher in regions with specific geology (Midwest, parts of South)

What to Do About Radium in Rexburg Water

1. Reverse osmosis (NSF 58 certified) removes 90%+ of radium
2. Ion exchange (water softeners) can reduce radium
3. Point-of-use RO at kitchen tap is most cost-effective
4. GAC filters alone are NOT effective for radium

Look for filters certified under NSF 58 for radium removal.

Related

• Radium — National Overview
• Idaho Water Quality
• Rexburg Water Quality
• Check Your ZIP Code