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Community Water System · PWS PA4110077

Blacklick Valley Muni Auth

Twin Rocks, Pennsylvania 15960 - drinking water served from surface water sources to 1,650 people, tracked in EPA SDWIS and UCMR5.

1,650
People served
174
EPA violations
101
Health-based
Untested
UCMR5 result

The verdict

EPA records 174 drinking-water violations at Blacklick Valley Muni Auth, 58% of them health-based - above the Pennsylvania per-system average.

174
Total EPA violations on record
58%
Health-based (MCL / treatment failure)
1,650
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Blacklick Valley Muni Auth

Blacklick Valley Muni Auth is a local-owned community water system that delivers drinking water to 1,650 residents in Twin Rocks, Pennsylvania (Cambria County) through 763 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 174 total violations for this system , of which 101 (58%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 26 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 53 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 Pennsylvania, EPA tracks 7,701 public water systems serving 12,630,061 people, with 1,159,868 cumulative violations and 68,517 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 150.6 violations. Statewide, 224 of 389 UCMR5-tested systems have reported PFAS detections (57.6%).

Blacklick Valley Muni Auth's 174 violations sit above the Pennsylvania 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
1,650
Total Violations
174
Health-Based Violations
101
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
763
County
Cambria
School/Daycare
No
MCL Violations
96
Monitoring Violations
26
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 53 2011
Total Haloacetic Acids (HAA5) MCL 43 2020
Public Notice Other 40 2025
Coliform (TCR) MR 10 2007
Revised Total Coliform Rule MON 7 2024
Revised Total Coliform Rule RPT 5 2018
Surface Water Treatment Rule TT 5 2025
TTHM MR 4 2005
Surface Water Treatment Rule MR 3 2005
Consumer Confidence Rule Other 2 2001
Chlorine MR 2 2005

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 Blacklick Valley Muni Auth.

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 PA4110077 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Pennsylvania Drinking Water Authority

Pennsylvania DEP, Bureau of Safe Drinking Water is the primacy agency that licenses and inspects Blacklick Valley Muni Auth under EPA-delegated authority.

Open PA regulator portal

Source: Pennsylvania DEP, Bureau of Safe Drinking Water

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 Public Notice Other 40 SDWIS / PA4110077 / 7500
2025 Surface Water Treatment Rule TT 5 SDWIS / PA4110077 / 0200
2024 Revised Total Coliform Rule MON 7 SDWIS / PA4110077 / 8000
2020 Total Haloacetic Acids (HAA5) MCL 43 SDWIS / PA4110077 / 2456
2018 Revised Total Coliform Rule RPT 5 SDWIS / PA4110077 / 8000
2011 TTHM MCL 53 SDWIS / PA4110077 / 2950
2007 Coliform (TCR) MR 10 SDWIS / PA4110077 / 3100
2005 TTHM MR 4 SDWIS / PA4110077 / 2950
2005 Surface Water Treatment Rule MR 3 SDWIS / PA4110077 / 0200
2005 Chlorine MR 2 SDWIS / PA4110077 / 0999
2001 Consumer Confidence Rule Other 2 SDWIS / PA4110077 / 7000

How Blacklick Valley Muni Auth Compares

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

Metric Blacklick Valley Muni Auth Pennsylvania avg Federal benchmark
Total violations 174 150.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 101 8.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 57.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,650 1,640 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,701 regulated public water systems in Pennsylvania.

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 Blacklick Valley Muni Auth water safe to drink? ▼
Blacklick Valley Muni Auth (PWS ID: PA4110077) has 174 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,650 people using Surface Water sources.
How many people does Blacklick Valley Muni Auth serve? ▼
Blacklick Valley Muni Auth serves 1,650 people in Twin Rocks, Pennsylvania. It is a Local-owned system using Surface Water water sources with 763 service connections.
What type of violations does Blacklick Valley Muni Auth have? ▼
Blacklick Valley Muni Auth has 174 total violations: 101 health-based violations (MCL exceedances or treatment failures), 26 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Blacklick Valley Muni Auth water? ▼
No PFAS testing data is available for Blacklick Valley Muni Auth under the EPA's UCMR5 monitoring program.
What water source does Blacklick Valley Muni Auth use? ▼
Blacklick Valley Muni Auth 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.