Castalian Springs, TN Water Safety: 55/100 (2026)
1 ZIP code · 3 water systems · Updated 2026-06-04
Public water data for Castalian Springs, TN reveals a split picture — tap water quality varies meaningfully by service area and the city's grade reflects that variability.
How Castalian Springs Compares
Data: EPA SDWIS Last verified: 2026-06-04
Castalian Springs Water: The Quick Version
- Homes built before 1986: 35% — older plumbing may contain lead solder.
- Estimated remediation: $2,200 per household.
- CDC health risk index: 13.8 — above typical levels.
Water Systems Serving Castalian Springs
3 water systems are tracked federally in Castalian Springs, TN. The top 3 providers collectively serve most residential addresses, but because they operate independently, infrastructure maintenance standards and compliance histories differ from one service zone to another.
Overview
We track water quality and home safety data for 1 ZIP code in Castalian Springs, Tennessee (population ~3,984), covering 3 community water systems serving approximately 90,710 people region-wide.
No EPA violations recorded across any ZIP codes in Castalian Springs — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Castalian Springs: C (55/100)
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
Castalian Springs water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Castalian Springs
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate 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 |
|---|---|---|---|
| 37031 | C | GALLATIN WATER DEPARTMENT | 65,964 |
All ZIP Codes in Castalian Springs
- 37031 [C]
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.
CDC Health Data for Castalian Springs
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
How Old Is Castalian Springs's Housing Stock?
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
Tap water lead levels are shaped by two factors: what the utility delivers, and what the household plumbing adds to it. Older homes contribute disproportionately to that second variable because lead solder was standard in copper plumbing before 1986, and lead pipes were common before 1970. In Castalian Springs, where the median build year is 1993, a substantial share of the housing stock falls into these older categories. The bar chart above breaks out the pre-1970, 1970-to-1986, and post-1986 segments — the key ages for understanding where plumbing-era risk concentrates across the city.
Most homes in Castalian Springs 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.
Castalian Springs: Remediation Cost in Perspective
Property equity in Castalian Springs runs well ahead of estimated remediation costs — a cost-to-value ratio that sits in the low tier, meaning documented water and safety issues here are the kind homeowners can plan to address without treating the expense as a significant budget event relative to what their homes are worth.
Remediation costs in Castalian Springs are relatively low compared to home values. The $1,200–$3,300 estimated range is a small fraction of median property value. Home values are 36% above the Tennessee average.
Protecting Children from Lead in Castalian Springs
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 35% of the Castalian Springs 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.
Climate-Related Water Risk for Castalian Springs
NFIP records stretching across multiple decades show Castalian Springs accumulating 23 claims and carrying 100% of its ZIP codes inside FEMA flood zones — evidence of meaningful exposure that extends beyond isolated incidents. The mechanisms linking flooding to water quality haven't changed: treatment facilities can be overwhelmed, wells can be infiltrated, and distribution systems can experience backflow. For a community at this exposure level, those mechanisms shift from hypothetical to periodically relevant.
Castalian Springs has a moderate flood history with 23 FEMA claims averaging $25,224 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>$2,200</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.
What You Can Do in Castalian Springs
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 35% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Castalian Springs, TN