Non-Transient Non-Community Water System · PWS AZ0420505
Marana High School
Operator location Marana, Arizona - upper-third violation load (> 74 violations) with 156 EPA violations; groundwater source; 2,450 served (PWS-level, not municipal population).
- 2,450
- People served (this PWS) Middle third of systems
- 156
- EPA violations (this PWS) Upper third of systems
- 4
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Marana High School standing, high SDWIS violation third
156 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 3% is middle-third health share (≤ 23%). Population rank #12,106 of 29,740 among systems serving 500+.
The verdict
Marana High School sits in the upper third of the sitemap cohort by violation count (156), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,450 (mid served population (≤ 3,309)). Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #12,106 of 29,740
- Population · /systems
- #172 of 413
- Population · AZ
- 156
- Total EPA violations on record
- 3%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 15
- County
- Pima
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 145
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 25 | 2015 |
| Coliform (TCR) | MR | 18 | 2015 |
| DICHLOROMETHANE | MR | 12 | 2002 |
| Nitrate | MR | 8 | 2019 |
| TTHM | MR | 4 | 2009 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2009 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 4 | 2024 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2002 |
| cis-1,2-Dichloroethylene | MR | 2 | 2002 |
| trans-1,2-Dichloroethylene | MR | 2 | 2002 |
| 1,2-Dichloroethane | MR | 2 | 2002 |
| 1,1,1-Trichloroethane | MR | 2 | 2002 |
| 1,1,2-Trichloroethane | MR | 2 | 2002 |
| Toluene | MR | 2 | 2002 |
| o-Dichlorobenzene | MR | 2 | 2002 |
| 1,1-Dichloroethylene | MR | 2 | 2002 |
| Carbon tetrachloride | MR | 2 | 2002 |
| Ethylbenzene | MR | 2 | 2002 |
| Styrene | MR | 2 | 2002 |
| Xylenes, Total | MR | 2 | 2002 |
| Benzene | MR | 2 | 2002 |
| CYANIDE | MR | 1 | 1998 |
| Nickel | MR | 1 | 1998 |
| Antimony, Total | MR | 1 | 1998 |
| Beryllium, Total | MR | 1 | 1998 |
| Thallium, Total | MR | 1 | 1998 |
| p-Dichlorobenzene | MR | 1 | 1998 |
| 1,2-Dichloropropane | MR | 1 | 1998 |
| BHC-GAMMA | MR | 1 | 1998 |
Violation Count vs. the National Corpus
Marana High School has 156 recorded EPA violations, 82% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 3% of this system's own violations are health-based (4 of 156), and it ranks #12,106 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
156 Higher than most more violations than 82% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
How many violations vs. how serious, among peer systems
Marana High School plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
SDWIS compliance record for Marana High School
156 violations on record for AZ0420505; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
156 violations · 2,450 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Marana High School
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arizona compares on the same EPA violation measures. Arizona systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.