Community Water System · PWS ID3140100
Rolling Hills Estates Water Company
Operator location Nampa, Idaho - smaller served population (≤ 999) at 250 people served; 122 SDWIS violations on record from groundwater sources.
- 250
- People served (this PWS)
- 122
- EPA violations (this PWS)
- 14
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Rolling Hills Estates Water Company standing, high SDWIS violation third
250 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 11% is middle-third health share (≤ 23%).
The verdict
Rolling Hills Estates Water Company sits in the upper third of the sitemap cohort by violation count (122), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (250; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 11% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 122
- Total EPA violations on record
- 11%
- Health-based (MCL / treatment failure)
- 250
- 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
- Community
- Owner Type
- Private
- Connections
- 137
- County
- Canyon
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 105
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 41 | 2003 |
| Coliform (TCR) | MCL | 14 | 2003 |
| Lead and Copper Rule | MR | 8 | 2023 |
| Chlorine | MR | 5 | 2024 |
| Nitrate | MR | 2 | 2002 |
| Simazine | MR | 1 | 2020 |
| 1,2-Dichloroethane | MR | 1 | 2017 |
| Vinyl chloride | MR | 1 | 2017 |
| Picloram | MR | 1 | 2020 |
| o-Dichlorobenzene | MR | 1 | 2017 |
| p-Dichlorobenzene | MR | 1 | 2017 |
| 2,4,5-TP | MR | 1 | 2020 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2020 |
| HEXACHLOROBENZENE | MR | 1 | 2020 |
| BHC-GAMMA | MR | 1 | 2020 |
| Ethylbenzene | MR | 1 | 2017 |
| Trichloroethylene | MR | 1 | 2017 |
| Heptachlor epoxide | MR | 1 | 2020 |
| Atrazine | MR | 1 | 2020 |
| cis-1,2-Dichloroethylene | MR | 1 | 2017 |
| Pentachlorophenol | MR | 1 | 2020 |
| Dalapon | MR | 1 | 2020 |
| Glyphosate | MR | 1 | 2020 |
| OXAMYL | MR | 1 | 2020 |
| Diquat | MR | 1 | 2020 |
| 1,1,2-Trichloroethane | MR | 1 | 2017 |
| Chlordane | MR | 1 | 2020 |
| Dinoseb | MR | 1 | 2020 |
| Heptachlor | MR | 1 | 2020 |
| Toluene | MR | 1 | 2017 |
Violation Count vs. the National Corpus
Rolling Hills Estates Water Company has 122 recorded EPA violations, 77% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 11% of this system's own violations are health-based (14 of 122), 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)
122 Higher than most more violations than 77% 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 Rolling Hills Estates Water Company
EPA SDWIS lists 250 people served and 137 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
122 violations · 250 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.
What to do with Rolling Hills Estates Water Company
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Idaho compares on the same EPA violation measures. Idaho 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.