CITY REPORT SC HEALTH VIOLATIONS: 4

Johnsonville, SC: 4 Health Violations - Home Safety 97/100

1 ZIP code · 2 water systems · Updated

ZipCheckup grade for Johnsonville: A.

Checked records flag no major concern; missing data is unknown.

Across Johnsonville, SC, the overall grade falls in the upper range - a summary score, not a measurement taken at any single tap.

How Johnsonville Compares

Johnsonville97/100
South Carolina avg80/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
2
Water Systems
1
ZIPs Linked to Systems with Violations
A · 97
Avg Safety Score
Zone 3
County Radon Potential (Low)
$119K
Median Home Value
$600
Est. Remediation (0.5% of home value)

Johnsonville Water: The Quick Version

  • Your city's water systems recorded 6 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.0056 mg/L.
  • Homes built before 1986: 60% - older plumbing may contain lead solder.
  • Estimated remediation: $600 per household.
  • Health risk index (ZipCheckup composite of CDC data): 14.61.

Water Systems Serving Johnsonville

Multiple utilities show up for Johnsonville, SC: 2 are listed here out of 2 tracked federally.

Overview

We track home safety data for 1 ZIP code in Johnsonville, South Carolina, covering 2 community water systems serving approximately 5,804 people. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.

1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. 4 health-based violations appear in the available health breakdown.

Home Safety Score

Average Home Safety Score for Johnsonville: A (97/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor What It Measures
Water Quality EPA violations and compliance history
PFAS MCL Screen UCMR 5 testing against the covered federal MCLs
Radon Risk EPA radon zone classification
Annual AQI EPA AirData county-year median with at least 90 observed days

Water Sources

Johnsonville water systems draw from: Groundwater.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0056 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 1 ZIP code with known status exceed the EPA lead action level

Radon Risk

1 of 1 ZIP records with known zones is in EPA Radon Zone 3.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Contaminant Category Violations ZIPs Affected
Total Trihalomethanes (TTHM) Disinfection Byproducts 8 1
Revised Total Coliform Rule Microbiological 2 1
Chlorine Disinfectant 2 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
29555 A 6 4 Johnsonville City of (sc2110011)

All ZIP Codes in Johnsonville

  • 29555 [A] - 6 violations ⚠

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

CDC Health Data for Johnsonville

10.3%
Asthma (US: 9.8%)
15.5%
Diabetes (US: 10.4%)
17.6%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.

Compared to National Average

Asthma 10.3% ↑
Diabetes 15.5% ↑
Mental Health 17.6% ↑

Vertical line = national average. ■ Above national · ■ Below national

Key Contaminants Detected in Johnsonville

Total Trihalomethanes (TTHM) 8 violations
Disinfection Byproducts · EPA regulatory level for the contaminant named above: 0.08 mg/L
Increased cancer risk with long-term exposure above the MCL
Revised Total Coliform Rule 2 violations
Microbiological
Indicates possible bacterial contamination
Chlorine 2 violations
Disinfectant · EPA regulatory level for the contaminant named above: 4 mg/L

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

How Old Is Johnsonville's Housing Stock?

1989
Median Build Year
60%
Built Before 1986
34%
Built Before 1970
Copper
Likely Pipe Material

With 60% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.

Source: U.S. Census Bureau American Community Survey (ACS).

Housing Age Profile

Some homes in Johnsonville predate the 1986 federal restrictions on lead in new pipe and solder, so a tap test is a reasonable step for older homes; median build year: 1989.

1989
Median Year Built
60%
Pre-1986 (lead solder era; lead paint banned 1978)
34%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (34%) 1970–1986 (26%) Post-1986 (40%)

Over half of homes in Johnsonville were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.

Source: U.S. Census Bureau ACS B25034.

Johnsonville: Remediation Cost in Perspective

Here the gap between local home values and the estimated repair bill is wide, so the percentage shown below for Johnsonville stays at or under the 1% mark.

Median Home Value
$118,900
Est. Remediation
$600
Remediation as % of home value 0.5%

Estimated remediation costs in Johnsonville can be compared with local home values. The $300–$1,500 estimated range can be set against the median property value; actual costs vary by home. Home values are 42% below the South Carolina average.

Protecting Children from Lead in Johnsonville

60%
Homes Built Before 1986
0.0056
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical Flood-Claim Evidence for Johnsonville

22
Total FEMA Flood Claims
$16,053
Avg Reported Sum With Payment Data
100%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Johnsonville contains 22 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $16,053. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

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. The $600 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.

Deep Dive Reports

Detailed analysis for Johnsonville, SC

Frequently Asked Questions

What does the Home Safety Score mean for Johnsonville, SC?
Johnsonville has an average Home Safety Score of 97/100 (Grade A) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. 6 violations appear in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving Johnsonville?
EPA records list 6 EPA violations, including 4 health-based violations for Johnsonville water systems. These water-system violations are shown for 1 mapped ZIP code.
Does Johnsonville water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Johnsonville is 0.0056 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Johnsonville compare to South Carolina average?
Johnsonville has an average Home Safety Score of 97/100, which is at or above the South Carolina state average of 80/100 for the same model series.
How many water systems serve Johnsonville?
Our records map 2 water systems to 1 ZIP code in Johnsonville. The related population figure in our data is approximately 5,804 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Johnsonville?
Estimated remediation cost per household in Johnsonville: $600; modeled range $300 to $1,500. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
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How to cite this page

APA ZipCheckup. (2026). Johnsonville, SC: 4 Health Violations - Home Safety 97/100. https://zipcheckup.com/cities/sc/johnsonville/
BibTeX 
@misc{zipcheckup-cities-sc-johnsonville,
  author = {{ZipCheckup}},
  title  = {{Johnsonville, SC: 4 Health Violations - Home Safety 97/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/sc/johnsonville/}
}

Page version: October 2026.

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