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Community Water System · PWS LA1021007

Holum Water System

Grayson, Louisiana 71435 - drinking water served from groundwater sources to 1,230 people, tracked in EPA SDWIS and UCMR5.

1,230
People served
310
EPA violations
239
Health-based
Untested
UCMR5 result

The verdict

EPA records 310 drinking-water violations at Holum Water System, 77% of them health-based - above the Louisiana per-system average.

310
Total EPA violations on record
77%
Health-based (MCL / treatment failure)
1,230
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Holum Water System

Holum Water System is a private-owned community water system that delivers drinking water to 1,230 residents in Grayson, Louisiana (Caldwell Parish County) through 410 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 310 total violations for this system , of which 239 (77%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 59 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is TTHM, recorded in 217 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 Louisiana, EPA tracks 1,234 public water systems serving 5,316,532 people, with 115,060 cumulative violations and 62,164 health-based violations on record. About 93% of systems in the state carry at least one violation, and state-wide the average per system is 93.2 violations. Statewide, 218 of 265 UCMR5-tested systems have reported PFAS detections (82.3%).

Holum Water System's 310 violations sit above the Louisiana 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
1,230
Total Violations
310
Health-Based Violations
239
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
410
County
Caldwell Parish
School/Daycare
No
MCL Violations
228
Monitoring Violations
59
Treatment Tech Violations
11

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 217 2025
TTHM MR 24 2017
Coliform (TCR) MR 15 2015
Chlorine MR 8 2015
Total Haloacetic Acids (HAA5) MR 8 2016
Groundwater Rule TT 7 2021
Total Haloacetic Acids (HAA5) MCL 7 2019
Public Notice Other 5 2018
Lead and Copper Rule MR 4 2005
Revised Total Coliform Rule TT 4 2022
Coliform (TCR) MCL 4 2014

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 Holum Water System.

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 LA1021007 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Louisiana Drinking Water Authority

Louisiana'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 LA 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
2025 TTHM MCL 217 SDWIS / LA1021007 / 2950
2022 Revised Total Coliform Rule TT 4 SDWIS / LA1021007 / 8000
2021 Groundwater Rule TT 7 SDWIS / LA1021007 / 0700
2019 Total Haloacetic Acids (HAA5) MCL 7 SDWIS / LA1021007 / 2456
2018 Public Notice Other 5 SDWIS / LA1021007 / 7500
2017 TTHM MR 24 SDWIS / LA1021007 / 2950
2016 Total Haloacetic Acids (HAA5) MR 8 SDWIS / LA1021007 / 2456
2015 Coliform (TCR) MR 15 SDWIS / LA1021007 / 3100
2015 Chlorine MR 8 SDWIS / LA1021007 / 0999
2014 Coliform (TCR) MCL 4 SDWIS / LA1021007 / 3100
2005 Lead and Copper Rule MR 4 SDWIS / LA1021007 / 5000

How Holum Water System Compares

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

Metric Holum Water System Louisiana avg Federal benchmark
Total violations 310 93.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 239 50.4 Indicates a contaminant exceeded a federal MCL
PFAS detection None 82.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,230 4,308 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,234 regulated public water systems in Louisiana.

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 Holum Water System water safe to drink? ▼
Holum Water System (PWS ID: LA1021007) has 310 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,230 people using Groundwater sources.
How many people does Holum Water System serve? ▼
Holum Water System serves 1,230 people in Grayson, Louisiana. It is a Private-owned system using Groundwater water sources with 410 service connections.
What type of violations does Holum Water System have? ▼
Holum Water System has 310 total violations: 239 health-based violations (MCL exceedances or treatment failures), 59 monitoring/reporting violations, and 11 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Holum Water System water? ▼
No PFAS testing data is available for Holum Water System under the EPA's UCMR5 monitoring program.
What water source does Holum Water System use? ▼
Holum Water System uses Groundwater 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.