Public water system record
Epcor - San Tan
Serves San Tan Valley and Florence, Pinal County, AZ · 87,435 people served
Federal records show 2 health-based violations and 50 monitoring/reporting issues for Epcor - San Tan in the last ten years. The most serious issue in this window was a resolved Nitrate violation.
System profile
- Health-based violations, last 10 years
- 2
- Resolved
- 2
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 50
Key facts
- Epcor - San Tan draws water from 18 wells.
- Highest measured level in the last 10 years: Nitrate, 12 mg/L, federal limit 10 mg/L (1.2 times the limit), 2017.
- Record on file since 1999, with 6 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 41,895 service lines.
Check whether Epcor - San Tan 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 |
|---|---|---|---|---|
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2016 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Chlorine
Monitoring and reporting
|
Dec 1, 2024 | Resolved |
|
Chlorine
Monitoring and reporting
|
Sep 1, 2024 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Styrene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Toluene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Benzene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
E. coli
Monitoring and reporting
|
Oct 7, 2020 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Dec 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Dec 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Sep 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Sep 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 1, 2017 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jun 1, 2017 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
Full record since 1999
EPA's records for Epcor - San Tan go back to 1999. Before October 19, 2016 they list 6 health-based violations (6 resolved) and 210 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 4 |
| 2000s | 2 | 198 |
| 2010 to October 18, 2016 | 3 | 8 |
| October 19, 2016 to 2019 | 1 | 18 |
| 2020s | 0 | 32 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began January 2016, Resolved.
Show all 6 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
Jan 1, 2016 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Aug 1, 2012 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 16 mg/L, federal limit 10 mg/L (1.6 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2000 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1999 | Resolved |
What the violations mean
Nitrate
2 incidentsNitrate exceeded the federal limit
High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome
Where the water comes from
Epcor - San Tan draws water from 18 wells.
Annual water quality report
Epcor - San Tan 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 Arizona.
Certified drinking water labs by state EPA guidance for private wells