Community Water System · PWS NH0773020
Colby Brook Estates
Epsom, New Hampshire 03234 - drinking water served from groundwater sources to 68 people, tracked in EPA SDWIS and UCMR5.
- 68
- People served
- 177
- EPA violations
- 30
- Health-based
- Untested
- UCMR5 result
The verdict
EPA records 177 drinking-water violations at Colby Brook Estates, 17% of them health-based - above the New Hampshire per-system average.
- 177
- Total EPA violations on record
- 17%
- Health-based (MCL / treatment failure)
- 68
- People served by this system
- N/A
- PFAS compounds detected (UCMR5)
Water Quality Snapshot: Colby Brook Estates
Colby Brook Estates is a private-owned community water system that delivers drinking water to 68 residents in Epsom, New Hampshire (Merrimack County) through 27 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 177 total violations for this system , of which 30 (17%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 126 monitoring and reporting violations are on file. The most recent violation on record dates to 2014.
The most frequently cited contaminant at this system is Arsenic, recorded in 18 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.
Across New Hampshire, EPA tracks 2,453 public water systems serving 1,242,123 people, with 155,970 cumulative violations and 29,649 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 63.6 violations. Statewide, 18 of 51 UCMR5-tested systems have reported PFAS detections (35.3%).
Colby Brook Estates's 177 violations sit above the New Hampshire average.
All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 27
- County
- Merrimack
- School/Daycare
- No
- MCL Violations
- 30
- Monitoring Violations
- 126
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 18 | 2013 |
| Arsenic | MR | 12 | 2007 |
| Coliform (TCR) | MCL | 12 | 2014 |
| Consumer Confidence Rule | Other | 8 | 2002 |
| Nitrate | MR | 5 | 1995 |
| 1,2,4-Trichlorobenzene | MR | 5 | 1995 |
| Xylenes, Total | MR | 5 | 1995 |
| o-Dichlorobenzene | MR | 5 | 1995 |
| Vinyl chloride | MR | 5 | 1995 |
| 1,1-Dichloroethylene | MR | 5 | 1995 |
| trans-1,2-Dichloroethylene | MR | 5 | 1995 |
| Carbon tetrachloride | MR | 5 | 1995 |
| Trichloroethylene | MR | 5 | 1995 |
| 1,1,2-Trichloroethane | MR | 5 | 1995 |
| Tetrachloroethylene | MR | 5 | 1995 |
| CHLOROBENZENE | MR | 5 | 1995 |
| Toluene | MR | 5 | 1995 |
| Ethylbenzene | MR | 5 | 1995 |
| Benzene | MR | 5 | 1995 |
| p-Dichlorobenzene | MR | 5 | 1995 |
| 1,1,1-Trichloroethane | MR | 5 | 1995 |
| 1,2-Dichloropropane | MR | 5 | 1995 |
| DICHLOROMETHANE | MR | 5 | 1995 |
| 1,2-Dichloroethane | MR | 5 | 1995 |
| Styrene | MR | 5 | 1995 |
| cis-1,2-Dichloroethylene | MR | 5 | 1995 |
| Coliform (TCR) | MR | 4 | 2013 |
Verify This Water System
The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Colby Brook Estates.
EPA SDWIS, Federal Reports
EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:
View PWS ID NH0773020 on SDWISSource: EPA SDWIS Federal Reports Search
New Hampshire Drinking Water Authority
New Hampshire's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.
Find NH regulator via EPA SDWISViolation Timeline
Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.
| Year (latest) | Contaminant | Category | Count | EPA Record |
|---|---|---|---|---|
| 2014 | Coliform (TCR) | MCL | 12 | SDWIS / NH0773020 / 3100 |
| 2013 | Arsenic | MCL | 18 | SDWIS / NH0773020 / 1005 |
| 2013 | Coliform (TCR) | MR | 4 | SDWIS / NH0773020 / 3100 |
| 2007 | Arsenic | MR | 12 | SDWIS / NH0773020 / 1005 |
| 2002 | Consumer Confidence Rule | Other | 8 | SDWIS / NH0773020 / 7000 |
| 1995 | Nitrate | MR | 5 | SDWIS / NH0773020 / 1040 |
| 1995 | 1,2,4-Trichlorobenzene | MR | 5 | SDWIS / NH0773020 / 2378 |
| 1995 | Xylenes, Total | MR | 5 | SDWIS / NH0773020 / 2955 |
| 1995 | o-Dichlorobenzene | MR | 5 | SDWIS / NH0773020 / 2968 |
| 1995 | Vinyl chloride | MR | 5 | SDWIS / NH0773020 / 2976 |
| 1995 | 1,1-Dichloroethylene | MR | 5 | SDWIS / NH0773020 / 2977 |
| 1995 | trans-1,2-Dichloroethylene | MR | 5 | SDWIS / NH0773020 / 2979 |
| 1995 | Carbon tetrachloride | MR | 5 | SDWIS / NH0773020 / 2982 |
| 1995 | Trichloroethylene | MR | 5 | SDWIS / NH0773020 / 2984 |
| 1995 | 1,1,2-Trichloroethane | MR | 5 | SDWIS / NH0773020 / 2985 |
How Colby Brook Estates Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | Colby Brook Estates | New Hampshire avg | Federal benchmark |
|---|---|---|---|
| Total violations | 177 | 63.6 | SDWA compliance, any non-zero count is a recorded breach |
| Health-based violations | 30 | 12.1 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 35.3% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 68 | 506 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,453 regulated public water systems in New Hampshire.
Federal MCL reference, Safe Drinking Water Act thresholds ▼
| Contaminant | Federal MCL / Action Level | Note |
|---|---|---|
| Lead | 0 mg/L (Action Level: 0.015 mg/L) | Lead and Copper Rule treatment technique |
| Arsenic | 0.010 mg/L (10 ppb) | Health-based MCL since 2006 |
| Total Coliform | Treatment technique (RTCR) | Indicator organism, monitoring trigger |
| PFOA / PFOS (PFAS) | 4.0 ppt each (final 2024 rule) | Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026) |
| Nitrate (as N) | 10 mg/L | Acute health risk for infants |
Frequently Asked Questions
Is Colby Brook Estates water safe to drink? ▼
How many people does Colby Brook Estates serve? ▼
What type of violations does Colby Brook Estates have? ▼
Has PFAS been detected in Colby Brook Estates water? ▼
What water source does Colby Brook Estates use? ▼
Where does this data come from? ▼
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.