Corvallis, MT: High Radon Risk — 70/100 (2026)
1 ZIP code · 3 water systems · Updated 2026-06-03
Water systems in Corvallis, MT serve households with few reported safety events.
How Corvallis Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Corvallis Water
- Average lead level: 0.001 mg/L.
- Homes built before 1986: 39% — older plumbing may contain lead solder.
- Estimated remediation: $2,400 per household.
- CDC health risk index: 12.93 — above typical levels.
Who Supplies Your Water in Corvallis
Corvallis, MT draws its residential water from 3 separate providers among the 3 federally tracked systems. Each operates independently, with its own infrastructure, rate structure, and compliance record.
Overview
We track water quality and home safety data for 1 ZIP code in Corvallis, Montana, covering 3 community water systems serving approximately 5,798 people.
No EPA violations recorded across any ZIP codes in Corvallis — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Corvallis: B (70/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Corvallis water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0010 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 59828 | B | Corvallis Mobile Village | 138 |
All ZIP Codes in Corvallis
- 59828 [B]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Corvallis
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Housing & Infrastructure in Corvallis
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Over the decades, Corvallis accumulated housing from multiple construction periods. The median build year of 1996 places the midpoint of that stock near the 1986 threshold when lead solder in plumbing became federally prohibited — leaving a sizable share of homes on each side of that safety line.
Most homes in Corvallis were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Corvallis Homeowners
In Corvallis, property values comfortably outpace what documented remediation typically costs — the equity share is proportionally low.
Remediation costs in Corvallis are relatively low compared to home values. The $1,600–$3,300 estimated range is a small fraction of median property value. Home values are 45% above the Montana average.
Lead Exposure Risk for Children in Corvallis
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
If 39% of the Corvallis inventory comes from before the federal ban on lead-bearing solder — and if utility samples sit at or near 0.015 mg/L — the gap between citywide averages and one specific faucet becomes a practical concern rather than a theoretical one. That is why one-home reads exist as a separate measurement. A certified filter through retailer networks addresses confirmed exposure where it appears in a household.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Corvallis
FEMA data shows 100% of Corvallis's ZIP codes mapped into designated flood zones, paired with an NFIP record of 2 claims. That footprint places local flood exposure in the range where it warrants attention without rising to high-severity planning territory.
Corvallis has a moderate flood history with 2 FEMA claims averaging $4,890 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,400</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Corvallis, MT