Transient Non-Community Water System · PWS WA53FS021
Johnston Ridge Observatory
Operator location Amboy, Washington - 0% of 15 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 2,506 served per SDWIS.
- 2,506
- People served (this PWS)
- 15
- EPA violations (this PWS)
- 0
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Johnston Ridge Observatory standing, low SDWIS violation third
0% of 15 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). Population rank #11,839 of 29,740 among systems serving 500+.
The verdict
Johnston Ridge Observatory is in the lower third by violation count (15; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is mid-pack at 2,506 (mid served population (≤ 3,309)). Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- #11,839 of 29,740
- Population · /systems
- #299 of 766
- Population · WA
- 15
- Total EPA violations on record
- 0%
- Health-based (MCL / treatment failure)
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
- Federal
- Connections
- 4
- County
- Skamania
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 15
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | MON | 15 | 2022 |
Violation Count vs. the National Corpus
Johnston Ridge Observatory has 15 recorded EPA violations, 25% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 74% carry more. 0% of this system's own violations are health-based (0 of 15), and it ranks #11,839 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)
15 Lower than most fewer violations than 74% 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
Health-based violations on Johnston Ridge Observatory
0 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for WA53FS021.
Sources: EPA SDWIS · Washington State Department of Health, Office of Drinking Water
Nationwide peers
15 violations · 2,506 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
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 Johnston Ridge Observatory
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Washington compares on the same EPA violation measures. Washington 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.