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Community Water System · PWS SC0750013

Harbor Island (Sc0750013)

Kiawah Island, South Carolina 29455 - drinking water served from surface water sources to 1,039 people, tracked in EPA SDWIS and UCMR5.

1,039
People served
52
EPA violations
26
Health-based
Untested
UCMR5 result

The verdict

EPA records 52 drinking-water violations at Harbor Island (Sc0750013), 50% of them health-based - above the South Carolina per-system average.

52
Total EPA violations on record
50%
Health-based (MCL / treatment failure)
1,039
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Harbor Island (Sc0750013)

Harbor Island (Sc0750013) is a local-owned community water system that delivers drinking water to 1,039 residents in Kiawah Island, South Carolina (Beaufort County) through 470 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 52 total violations for this system , of which 26 (50%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 22 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across South Carolina, EPA tracks 1,390 public water systems serving 4,709,324 people, with 38,355 cumulative violations and 9,705 health-based violations on record. About 65% of systems in the state carry at least one violation, and state-wide the average per system is 27.6 violations. Statewide, 107 of 164 UCMR5-tested systems have reported PFAS detections (65.2%).

Harbor Island (Sc0750013)'s 52 violations sit above the South Carolina average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,039
Total Violations
52
Health-Based Violations
26
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
470
County
Beaufort
School/Daycare
No
MCL Violations
22
Monitoring Violations
22
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 22 2012
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 10 2009
Lead and Copper Rule MR 4 1999
Lead and Copper Rule TT 4 2005
TTHM MR 4 2016
Coliform (TCR) MR 4 2010
Consumer Confidence Rule Other 3 2007

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Harbor Island (Sc0750013).

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID SC0750013 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

South Carolina Drinking Water Authority

South Carolina's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find SC regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2016 TTHM MR 4 SDWIS / SC0750013 / 2950
2012 Coliform (TCR) MCL 22 SDWIS / SC0750013 / 3100
2010 Coliform (TCR) MR 4 SDWIS / SC0750013 / 3100
2009 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 10 SDWIS / SC0750013 / 0600
2007 Consumer Confidence Rule Other 3 SDWIS / SC0750013 / 7000
2005 Lead and Copper Rule TT 4 SDWIS / SC0750013 / 5000
1999 Lead and Copper Rule MR 4 SDWIS / SC0750013 / 5000

How Harbor Island (Sc0750013) Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Harbor Island (Sc0750013) South Carolina avg Federal benchmark
Total violations 52 27.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 26 7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 65.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,039 3,388 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,390 regulated public water systems in South Carolina.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Harbor Island (Sc0750013) water safe to drink? ▼
Harbor Island (Sc0750013) (PWS ID: SC0750013) has 52 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,039 people using Surface Water sources.
How many people does Harbor Island (Sc0750013) serve? ▼
Harbor Island (Sc0750013) serves 1,039 people in Kiawah Island, South Carolina. It is a Local-owned system using Surface Water water sources with 470 service connections.
What type of violations does Harbor Island (Sc0750013) have? ▼
Harbor Island (Sc0750013) has 52 total violations: 26 health-based violations (MCL exceedances or treatment failures), 22 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Harbor Island (Sc0750013) water? ▼
No PFAS testing data is available for Harbor Island (Sc0750013) under the EPA's UCMR5 monitoring program.
What water source does Harbor Island (Sc0750013) use? ▼
Harbor Island (Sc0750013) uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.