Public water system record
Lago Guajataca
On record as serving Isabela and San Sebastián, Isabela Municipio and San Sebastián Municipio, PR · Serves 11,187 people
Federal records show 17 health-based violations and 54 monitoring/reporting issues for Lago Guajataca in the last ten years. The most serious issue in this window was a resolved Interim Enhanced Surface Water Treatment Rule violation.
System profile
Source water
Surface water
ZIP
00662
EPA system ID
PR0003772
- Health-based violations, last 10 years
- 17
- Resolved
- 17
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 54
Key facts
- Lago Guajataca draws water from 2 surface water intakes.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2019.
- Most recent formal enforcement: civil case filed in court by Puerto Rico, October 2019.
- Record on file since 1992, with 92 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,518 unknown out of 5,294 service lines.
Check whether Lago Guajataca serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
|
120 | Mar 1, 2022 | Resolved | Yes |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.094 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
CARBON, TOTAL
Treatment technique failure
|
210 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
220 | Oct 1, 2016 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2024 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Sep 1, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2020 | Resolved |
|
E. coli
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Turbidity
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Feb 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Surface Water Treatment Rule
Monitoring and reporting
|
Jan 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Consumer Confidence Rule
OTHER
|
Oct 1, 2018 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
May 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Surface Water Treatment Rule
Monitoring and reporting
|
Apr 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
E. coli
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Turbidity
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Mar 1, 2018 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Mar 1, 2018 | Resolved |
|
Turbidity
Monitoring and reporting
|
Mar 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Feb 1, 2018 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Feb 1, 2018 | Resolved |
|
Turbidity
Monitoring and reporting
|
Feb 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Turbidity
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
E. coli
Monitoring and reporting
|
Aug 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Aug 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
Aug 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
May 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
May 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
May 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Feb 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Feb 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
Feb 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Turbidity
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
E. coli
Monitoring and reporting
|
Oct 1, 2016 | Resolved |
|
Cryptosporidium
Monitoring and reporting
|
Oct 1, 2016 | Resolved |
|
Turbidity
Monitoring and reporting
|
Oct 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Apr 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2015 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Apr 1, 2015 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2014 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2013 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2013 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2012 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2012 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2011 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2010 | Resolved |
Full record since 1992
EPA's records for Lago Guajataca go back to 1992. Before October 19, 2016 they list 92 health-based violations (19 resolved, 73 archived by EPA without a recorded fix) and 67 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 42 | 28 |
| 2000s | 43 | 17 |
| 2010 to October 18, 2016 | 7 | 22 |
| October 19, 2016 to 2019 | 12 | 38 |
| 2020s | 3 | 3 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2016, Resolved.
Show all 92 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.073 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jul 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Apr 1, 2016 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jan 1, 2016 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jan 1, 2010 | Archived |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Sep 1, 2009 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Aug 1, 2009 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jul 1, 2009 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jun 1, 2009 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
May 1, 2009 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Oct 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Sep 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Aug 1, 2006 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
|
Jul 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Jul 1, 2006 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Apr 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Apr 1, 2006 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Oct 1, 2005 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Aug 1, 2005 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 2004 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2004 | Archived |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Sep 1, 2004 | Archived |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
May 1, 2004 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2003 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
May 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Apr 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2002 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Nov 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2001 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2000 | Archived |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2000 | Archived |
42 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
Puerto Rico regulators took 18 formal enforcement actions against Lago Guajataca between 1994 and 2019. The most recent was a civil case filed in court in October 2019.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 18, 2019 | Puerto Rico | Civil case filed in court | 1 violation (1 health-based): Haloacetic Acids (HAA5) |
| Jul 26, 2019 | Puerto Rico | Civil case filed in court | 2 violations (2 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Jul 23, 2019 | Puerto Rico | Civil case filed in court | 3 violations (3 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| May 8, 2018 | Puerto Rico | Civil case filed in court | 2 violations (2 health-based): Total Trihalomethanes (TTHMs) |
| Aug 8, 2017 | Puerto Rico | Civil case filed in court | 1 violation (1 health-based): CARBON, TOTAL |
| Oct 26, 2016 | Puerto Rico | Civil case filed in court | 4 violations (4 health-based): Total Trihalomethanes (TTHMs) |
| Apr 14, 2016 | Puerto Rico | Civil case filed in court | 3 violations (3 health-based): Haloacetic Acids (HAA5) |
| Apr 10, 2016 | Puerto Rico | Civil case filed in court | 1 violation (1 health-based): Haloacetic Acids (HAA5) |
| Jan 26, 2016 | Puerto Rico | Civil case filed in court | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
| Sep 2, 2010 | Puerto Rico | Civil case filed in court | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
| Feb 10, 2010 | Puerto Rico | Civil case filed in court | 5 violations (5 health-based): Interim Enhanced Surface Water Treatment Rule |
| Feb 26, 2008 | Puerto Rico | Civil case filed in court | 5 violations (5 health-based): Interim Enhanced Surface Water Treatment Rule |
| Nov 16, 2007 | Puerto Rico | Civil case filed in court | 5 violations (5 health-based): Interim Enhanced Surface Water Treatment Rule |
| May 25, 2007 | Puerto Rico | Consent decree or court judgment | 5 violations (5 health-based): Interim Enhanced Surface Water Treatment Rule |
| Apr 25, 2003 | Puerto Rico | Compliance order with a penalty | 81 violations (65 health-based): Surface Water Treatment Rule |
| Jun 30, 2001 | Puerto Rico | Compliance order (no penalty) | 73 violations (57 health-based): Surface Water Treatment Rule |
| Jun 30, 1998 | Puerto Rico | Compliance order with a penalty | 55 violations (42 health-based): Surface Water Treatment Rule |
| Jun 3, 1994 | Puerto Rico | Compliance order (no penalty) | 1 violation: Total Coliform |
What the violations mean
Total Trihalomethanes (TTHMs)
10 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Haloacetic Acids (HAA5)
5 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Interim Enhanced Surface Water Treatment Rule
1 incidentThe system did not meet a filtration or treatment requirement for surface water
Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through
CARBON, TOTAL
1 incidentThe system did not complete a treatment step or action that federal rules require for CARBON, TOTAL (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Lago Guajataca draws water from 2 surface water intakes.
Annual water quality report
Lago Guajataca must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Puerto Rico.
Certified drinking water labs by state EPA guidance for private wells