Public water system record
Northern Section 4 Coop
Serves an area of Pinal County, AZ that includes Apache Junction · 48 people served
Federal records show 2 health-based violations and 15 monitoring/reporting issues for Northern Section 4 Coop 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
- 15
Key facts
- Northern Section 4 Coop draws water from 2 wells.
- Highest measured level in the last 10 years: Nitrate, 27.7 mg/L, federal limit 10 mg/L (2.8 times the limit), 2016.
- Record on file since 1987, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 18 service lines.
Check whether Northern Section 4 Coop 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 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2017 | Resolved | Yes |
|
Nitrate
Contaminant limit exceeded
Measured 27.7 mg/L, federal limit 10 mg/L (2.8 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 |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2025 | Active |
|
Public Notice
OTHER
|
Jul 25, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2024 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Mar 1, 2024 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Oct 2, 2023 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Public Notice
OTHER
|
Jan 28, 2022 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Jun 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Dec 1, 2020 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Oct 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2016 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2002 | Active |
Full record since 1987
EPA's records for Northern Section 4 Coop go back to 1987. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 262 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 18 |
| 1990s | 0 | 114 |
| 2000s | 2 | 98 |
| 2010 to October 18, 2016 | 1 | 32 |
| October 19, 2016 to 2019 | 1 | 2 |
| 2020s | 0 | 10 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began January 2016, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
Measured 27.7 mg/L, federal limit 10 mg/L (2.8 times the limit)
|
Jan 1, 2016 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
Oct 1, 2005 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
Oct 1, 2005 | 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
Northern Section 4 Coop draws water from 2 wells. It also has a seasonal connection to Arizona Water Co - Apache Junction.
Emergency or part-time connections to
- Arizona Water Co - Apache Junction Phoenix, AZ
Annual water quality report
Northern Section 4 Coop 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 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Northern Section 4 Coop for a copy.
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