Transient Non-Community Water System · PWS AZ0401021
AZ State Parks - Lyman Lake
Operator location St Johns, Arizona - smaller served population (≤ 999) at 100 people served; 70 SDWIS violations on record from groundwater sources.
- 100
- People served (this PWS)
- 70
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
AZ State Parks - Lyman Lake standing, mid SDWIS violation third
100 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%).
The verdict
AZ State Parks - Lyman Lake lands in the middle third by violation volume (70), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (100; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 70
- Total EPA violations on record
- 9%
- Health-based (MCL / treatment failure)
- 100
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 49
- County
- Apache
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 53
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 18 | 2014 |
| Nitrate | MR | 13 | 2015 |
| Revised Total Coliform Rule | MON | 5 | 2020 |
| Arsenic | MR | 3 | 1989 |
| Mercury | MR | 3 | 1989 |
| Chromium | MR | 3 | 1989 |
| Revised Total Coliform Rule | MCL | 3 | 2016 |
| Selenium | MR | 2 | 1989 |
| Barium | MR | 2 | 1989 |
| Fluoride | MR | 2 | 1989 |
| Cadmium | MR | 2 | 1989 |
| Coliform (TCR) | MCL | 2 | 2011 |
| Revised Total Coliform Rule | RPT | 2 | 2022 |
| Public Notice | Other | 1 | 2021 |
| Chromium | MCL | 1 | 1982 |
Violation Count vs. the National Corpus
AZ State Parks - Lyman Lake has 70 recorded EPA violations, 65% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 35% carry more. 9% of this system's own violations are health-based (6 of 70), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
70 Around the middle fewer violations than 35% 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
Population served record for AZ State Parks - Lyman Lake
EPA SDWIS lists 100 people served and 49 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
70 violations · 100 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with AZ State Parks - Lyman Lake
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.