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Community Water System · PWS PR0653026

Com. Rancho Grande

Naguabo, Puerto Rico 00718 - drinking water served from surface water sources to 1,428 people, tracked in EPA SDWIS and UCMR5.

1,428
People served
666
EPA violations
203
Health-based
Untested
UCMR5 result

The verdict

EPA records 666 drinking-water violations at Com. Rancho Grande, 30% of them health-based - above the Puerto Rico per-system average.

666
Total EPA violations on record
30%
Health-based (MCL / treatment failure)
1,428
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Com. Rancho Grande

Com. Rancho Grande is a private-owned community water system that delivers drinking water to 1,428 residents in Naguabo, Puerto Rico (Naguabo Municipio County) through 535 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 666 total violations for this system , of which 203 (30%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 388 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 236 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Puerto Rico, EPA tracks 458 public water systems serving 3,328,141 people, with 164,144 cumulative violations and 34,657 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 358.4 violations. Statewide, 40 of 99 UCMR5-tested systems have reported PFAS detections (40.4%).

Com. Rancho Grande's 666 violations sit above the Puerto Rico 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
1,428
Total Violations
666
Health-Based Violations
203
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
535
County
Naguabo Municipio
School/Daycare
No
MCL Violations
183
Monitoring Violations
388
Treatment Tech Violations
20

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 236 2015
Coliform (TCR) MCL 183 2015
Surface Water Treatment Rule MR 149 2005
Surface Water Treatment Rule TT 18 2008
Revised Total Coliform Rule MON 3 2019
LEAD AND COPPER RULE REVISIONS TT 2 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

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 Com. Rancho Grande.

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 PR0653026 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Puerto Rico Drinking Water Authority

Puerto Rico'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 PR 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
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / PR0653026 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / PR0653026 / 5200
2019 Revised Total Coliform Rule MON 3 SDWIS / PR0653026 / 8000
2015 Coliform (TCR) MR 236 SDWIS / PR0653026 / 3100
2015 Coliform (TCR) MCL 183 SDWIS / PR0653026 / 3100
2008 Surface Water Treatment Rule TT 18 SDWIS / PR0653026 / 0200
2005 Surface Water Treatment Rule MR 149 SDWIS / PR0653026 / 0200

How Com. Rancho Grande Compares

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

Metric Com. Rancho Grande Puerto Rico avg Federal benchmark
Total violations 666 358.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 203 75.7 Indicates a contaminant exceeded a federal MCL
PFAS detection None 40.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,428 7,267 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 458 regulated public water systems in Puerto Rico.

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 Com. Rancho Grande water safe to drink? ▼
Com. Rancho Grande (PWS ID: PR0653026) has 666 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,428 people using Surface Water sources.
How many people does Com. Rancho Grande serve? ▼
Com. Rancho Grande serves 1,428 people in Naguabo, Puerto Rico. It is a Private-owned system using Surface Water water sources with 535 service connections.
What type of violations does Com. Rancho Grande have? ▼
Com. Rancho Grande has 666 total violations: 203 health-based violations (MCL exceedances or treatment failures), 388 monitoring/reporting violations, and 20 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Com. Rancho Grande water? ▼
No PFAS testing data is available for Com. Rancho Grande under the EPA's UCMR5 monitoring program.
What water source does Com. Rancho Grande use? ▼
Com. Rancho Grande 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.