Public water system record
Twin Hills Water System
Serves Twin Hills, Dillingham Census Area, AK · 87 people served
Federal records show 9 health-based violations and 144 monitoring/reporting issues for Twin Hills Water System in the last ten years. The most serious issue in this window was a resolved Groundwater Rule violation.
System profile
Source water
Groundwater
ZIP
99576
EPA system ID
AK2260032
- Health-based violations, last 10 years
- 9
- Resolved
- 9
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 144
Key facts
- Twin Hills Water System draws water from 2 wells.
- Most recent enforcement action: boil water order by Alaska, July 2024.
- Record on file since 1979, with 8 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 37 service lines.
Check whether Twin Hills Water System 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 |
|---|---|---|---|---|
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 5, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 4, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 4, 2020 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Jul 1, 2014 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Oct 1, 2025 | Resolved |
|
Chlordane
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
2,4-D
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
2,3,7,8-TCDD
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
LASSO
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Atrazine
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Picloram
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Simazine
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Endothall
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Diquat
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Dalapon
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Endrin
Monitoring and reporting
|
Oct 1, 2025 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2025 | Resolved |
|
Chlordane
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
2,4-D
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
2,3,7,8-TCDD
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
LASSO
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Atrazine
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Picloram
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Simazine
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Endothall
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Diquat
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Dalapon
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Endrin
Monitoring and reporting
|
Jul 1, 2025 | Resolved |
|
Groundwater Rule
OTHER
|
Jun 22, 2025 | Resolved |
|
Chlordane
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
2,4-D
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
2,3,7,8-TCDD
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
LASSO
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Atrazine
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Picloram
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Simazine
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Endothall
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Diquat
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Dalapon
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Endrin
Monitoring and reporting
|
Apr 1, 2025 | Resolved |
|
Chlordane
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
ETHYLENE DIBROMIDE
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
1,2-DIBROMO-3-CHLOROPROPANE
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Total Polychlorinated Biphenyls (PCB)
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Pentachlorophenol
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Benzo(a)pyrene
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
HEXACHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
2,4,5-TP
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
2,4-D
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Heptachlor epoxide
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Heptachlor
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
2,3,7,8-TCDD
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
LASSO
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Atrazine
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Carbofuran
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Hexachlorocyclopentadiene
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Dinoseb
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Picloram
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Di(2-ethylhexyl) phthalate
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Simazine
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
OXAMYL
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Di(2-ethylhexyl) adipate
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Endothall
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Diquat
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Dalapon
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Toxaphene
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Methoxychlor
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
BHC-GAMMA
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Endrin
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Dec 1, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2024 | Resolved |
|
Public Notice
OTHER
|
Jul 11, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2024 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 | Resolved |
|
Groundwater Rule
OTHER
|
Nov 17, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Mar 1, 2023 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Dec 1, 2021 | Resolved |
|
Public Notice
OTHER
|
Aug 4, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2021 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2021 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2021 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2019 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2016 | Resolved |
Full record since 1979
EPA's records for Twin Hills Water System go back to 1979. Before October 19, 2016 they list 8 health-based violations (1 resolved, 7 archived by EPA without a recorded fix) and 146 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1980s | 0 | 17 |
| 1990s | 4 | 63 |
| 2000s | 3 | 41 |
| 2010 to October 18, 2016 | 1 | 24 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 8 | 142 |
Most recent health-based violation before October 19, 2016: Groundwater Rule, began July 2014, Resolved.
Show all 8 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Groundwater Rule
Treatment technique failure
|
Jul 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2006 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2004 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2002 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1997 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1994 | Archived |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 1993 | Archived |
Enforcement actions
Alaska regulators issued 16 boil water orders to Twin Hills Water System between 1993 and 2024. The most recent was a boil water order in July 2024.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 9, 2024 | Alaska | Boil water order | 1 violation |
| Sep 5, 2023 | Alaska | Boil water order | 1 violation |
| Dec 5, 2022 | Alaska | Boil water order | 1 violation |
| Aug 3, 2021 | Alaska | Boil water order | 1 violation |
| Jan 13, 2021 | Alaska | Boil water order | 1 violation |
| Nov 19, 2020 | Alaska | Boil water order | 1 violation |
| Nov 14, 2017 | Alaska | Boil water order | 1 violation |
| Aug 22, 2017 | Alaska | Boil water order | 1 violation |
| Feb 23, 2011 | Alaska | Boil water order | 1 violation |
| May 5, 2010 | Alaska | Boil water order | 1 violation |
| Mar 23, 2010 | Alaska | Boil water order | 1 violation |
| Sep 17, 2006 | Alaska | Boil water order | 1 violation |
| Oct 16, 2004 | Alaska | Boil water order | 1 violation (1 health-based): Total Coliform |
| Oct 25, 2002 | Alaska | Boil water order | 1 violation |
| Oct 20, 1995 | Alaska | Boil water order | 1 violation (1 health-based): Total Coliform |
| Jan 11, 1993 | Alaska | Boil water order | 1 violation |
What the violations mean
Groundwater Rule
9 incidentsThe system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Twin Hills Water System draws water from 2 wells.
Annual water quality report
Twin Hills Water System 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 Twin Hills Water System 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 Alaska.
Certified drinking water labs by state EPA guidance for private wells