Water system
Guilford Lake Estates
EPA ID OH1503412 · Columbiana County · 125 people served
Guilford Lake Estates treats its own water from Groundwater wells (2 wells).
The system's record
- Active wells
- 2
- Serves
- 125 people · Columbiana County
- EPA ID
- OH1503412
About this area's water
Did you know
- Guilford Lake Estates is a very small water system, serving an estimated population of only about 125 people via two wells and 75 service connections (per EPA's federal SDWIS database).
- It anchors the 43962 Summitville ZIP code, a rural area near Guilford Lake State Park in Columbiana County.
Source: data.epa.gov
Treatment & pressure
How it is treated
We found no published treatment description. EPA's federal SDWIS database lists this as an active, privately owned, 2-well community groundwater system with 75 service connections.
Source: data.epa.gov
Water pressure
not published
What it costs
No published rate schedule was found for Guilford Lake Estates.
Water quality & impurities
EPA compliance record
Lead at the tap: 90th-percentile result 0 ppb in 2023 (action level 15 ppb).
EPA record: no health-based violations since 2015.
2 violations of any kind logged since 2020: 2 for a report, record or notice that was missing, late or incomplete (the yearly water quality report, a public notice, lead line records).
Supply stress
No documented contamination or capacity issue was found. Federal SDWIS/ECHO compliance records (data.epa.gov) show three violations over the yearly water quality report (the Consumer Confidence Report) since 2015, none health-based, with the most recent one opened 1/14/2026 and still unresolved as of this check; no numeric contaminant…
Source: data.epa.gov
Sourcesverified
Compiled from the utility's own reports and public records, then independently re-checked against primary sources. Little is published about this system, so details are thin.
Main supplier in 1 ZIP code
Serves
Main water supplier in 1 ZIP code
- 43962 · Summitville35% of residents
Population-weighted resident shares; a ZIP code can have more than one system on record. Recomputed from each ZIP's own system list, not from the map's cached footprint.
Buys from · Sells to
Guilford Lake Estates does not buy water from another system on record; it treats its own source water.
No other system is on record buying water from Guilford Lake Estates.
What the records show about Guilford Lake Estates
Who runs it
EPA's record says Guilford Lake Estates has 75 service connections and serves 125 people.
EPA classes it as a community water system, one that serves the same residents all year.
Its office telephone on EPA's record is 330-714-8700.
Source: EPA Safe Drinking Water Information System (SDWIS), water system record.
How the water is treated
EPA's treatment table registers these steps for Guilford Lake Estates: chlorine disinfection.
The list is what each system registered with EPA for treatment plants EPA still shows as active, and it can lag a plant upgrade.
Source: EPA Safe Drinking Water Information System (SDWIS) treatment table (EPA Envirofacts, pulled September 2026).
Violations
EPA's record shows no health-based violations for Guilford Lake Estates since 2015.
EPA logs 2 violations of any kind since 2020: 2 for a report, record or notice that was missing, late or incomplete (the yearly water quality report, a public notice, lead line records).
Source: EPA Safe Drinking Water Information System (SDWIS) violation records: health-based violations with compliance periods beginning in 2015 or later, all violations from 2020 or later (EPA Envirofacts, pulled September 2026).
Lead and copper at the tap
In the sampling period ending December 2023, the 90th-percentile lead result at Guilford Lake Estates was 0 ppb, under both the current 15 ppb action level and the 10 ppb level that applies from 2027. A result of 0 means at least nine in ten of the homes sampled had no lead detected.
The highest result on file is 5.1 ppb, in the period ending December 2019.
EPA has 4 sampling periods on file for Guilford Lake Estates since 2016, the first ending in 2016; no period was above 10 ppb.
Every water system has to inventory its service lines, the pipes from the main to each building. In the inventory Guilford Lake Estates sent EPA, 70 lines are counted.
| Material | Lines |
|---|---|
| Lead | 0 |
| Galvanized, needing replacement | 0 |
| Unknown material | 0 |
| Not lead | 70 |
| All lines | 70 |
Systems sample taps in the homes most likely to have lead pipes or solder. The 90th-percentile result is the level nine in ten of the sampled homes were at or below. Lead comes mostly from service lines and house plumbing, not the source water, so a low result for the system does not clear an old house.
EPA's dashboard status for this inventory: reported all required service line types.
Source: EPA Safe Drinking Water Information System (SDWIS) lead and copper 90th-percentile results (EPA Envirofacts), sampling periods ending 2016 or later; EPA's service line inventory dashboard, Ohio's 2026 Q2 submission.
PFAS
Ohio EPA's own statewide sampling tested 1 plant of Guilford Lake Estates (latest sample August 2020). Not one of the six PFAS tested (PFOA, PFOS, PFHxS, PFNA, GenX and PFBS) was detected.
PFAS are the 'forever chemicals' from firefighting foam, plating shops and non-stick coatings. Results are for water leaving the plant, not your tap.
Source: EPA UCMR 5 occurrence data (final release, August 2026); Ohio EPA statewide PFAS sampling, 2019 to 2021, and its sampling status map.
Disinfection byproducts
Chlorine that disinfects water also reacts with organic matter to form byproducts. Two groups have federal limits: total trihalomethanes (TTHM, 80 µg/L) and five haloacetic acids (HAA5, 60 µg/L), judged on running yearly averages at each sampling site.
For TTHM, the average of Guilford Lake Estates's samples in 2019, the last year it was sampled, was 0 µg/L. The worst yearly average was 3.4 µg/L and the highest single sample was 3.4 µg/L, from 7 samples taken from 2013 to 2019.
For HAA5, the average in the last year sampled was 1.8 µg/L. The worst yearly average was 10.7 µg/L and the highest single sample was 10.7 µg/L, from 7 samples.
| Byproduct | Limit | Latest yearly average | Worst yearly average | Highest sample | Samples |
|---|---|---|---|---|---|
| TTHM | 80 µg/L | 0 µg/L (2019) | 3.4 µg/L | 3.4 µg/L | 7 |
| HAA5 | 60 µg/L | 1.8 µg/L | 10.7 µg/L | 10.7 µg/L | 7 |
A yearly average of 0 means nothing was detected in that year's samples. EPA's file stops at 2019; Ohio EPA's Drinking Water Watch has newer results.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, distribution-system samples (non-detects counted as zero).
Nitrate, arsenic and radioactivity
Nitrate: the highest of 9 samples was 0.61 mg/L (as nitrogen) in 2017; in 2019, the last year sampled, nitrate was not detected. No sample was over the limit of 10 mg/L. Nitrate above 10 is unsafe for infants.
Arsenic was not detected in 2 samples (limit 10 µg/L).
| Contaminant | Samples | Highest result | Limit | Samples over limit |
|---|---|---|---|---|
| Nitrate (as nitrogen) | 9 | 0.61 mg/L | 10 mg/L | 0 |
| Arsenic | 2 | not detected | 10 µg/L | 0 |
Measured in finished water: at the plant's entry points and in the distribution system; raw well and intake samples are left out. Non-detects count as zero.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.
Solvents and fuels
EPA's file holds results for all six solvent and fuel compounds it checked. carbon tetrachloride was detected in 1 of 3 samples, highest 2.08 µg/L (limit 5). Benzene, 1,2-dichloroethane, trichloroethylene, tetrachloroethylene, and vinyl chloride were not detected in 3 samples each.
| Compound | Limit | Samples | Detected in | Highest result | Samples over limit |
|---|---|---|---|---|---|
| Benzene | 5 µg/L | 3 | 0 of 3 | not detected | 0 |
| Carbon tetrachloride | 5 µg/L | 3 | 1 of 3 | 2.08 µg/L | 0 |
| 1,2-dichloroethane | 5 µg/L | 3 | 0 of 3 | not detected | 0 |
| Trichloroethylene (TCE) | 5 µg/L | 3 | 0 of 3 | not detected | 0 |
| Tetrachloroethylene (PCE) | 5 µg/L | 3 | 0 of 3 | not detected | 0 |
| Vinyl chloride | 2 µg/L | 3 | 0 of 3 | not detected | 0 |
"Not detected" means the lab's result was below what its method can measure, not that the compound is absent. Non-detects count as zero in the highest-result column.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.
Farm chemicals and metals
EPA's file holds results for 8 of the nine herbicides and metals it checked. Detected: barium in 2 of 2 samples, highest 330 µg/L (limit 2,000). Not detected: atrazine, alachlor, chromium, cadmium, mercury, selenium, and thallium, in 2 samples each.
| Substance | Kind | Limit | Samples | Detected in | Highest result | Samples over limit |
|---|---|---|---|---|---|---|
| Atrazine | Farm chemical | 3 µg/L | 2 | 0 of 2 | not detected | 0 |
| Alachlor | Farm chemical | 2 µg/L | 2 | 0 of 2 | not detected | 0 |
| Chromium | Metal | 100 µg/L | 2 | 0 of 2 | not detected | 0 |
| Cadmium | Metal | 5 µg/L | 2 | 0 of 2 | not detected | 0 |
| Barium | Metal | 2,000 µg/L | 2 | 2 of 2 | 330 µg/L | 0 |
| Mercury | Metal | 2 µg/L | 2 | 0 of 2 | not detected | 0 |
| Selenium | Metal | 50 µg/L | 2 | 0 of 2 | not detected | 0 |
| Thallium | Metal | 2 µg/L | 2 | 0 of 2 | not detected | 0 |
Non-detects count as zero in the highest-result column.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, finished water.
Bacteria in the pipes
From 2012 to 2019, 0 of 96 routine total coliform samples taken in the distribution system at Guilford Lake Estates tested positive (0%); in 2019, the last year on file, 0 of 12 did.
A positive coliform test is a warning sign, not a violation by itself. E. coli is a sign that human or animal waste may have reached the water. Coliform counts are routine samples only; E. coli counts include repeat samples.
Source: EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, distribution-system presence/absence tests for total coliform and E. coli.
Fluoride
The Ohio Department of Health's report to the CDC (My Water's Fluoride) says Guilford Lake Estates has fluoride from natural sources at the recommended level for preventing tooth decay.
EPA's treatment table lists no fluoridation step at Guilford Lake Estates.
Measured fluoride: 0.54 mg/L on average at the plant's entry points in 2017 (below the 0.7 mg/L target); samples ran from 0.53 to 0.54 mg/L across 2 samples in 2012 to 2019.
The recommended level for preventing tooth decay is 0.7 mg/L; the federal limit is 4 mg/L. The treatment list is what each system registered with EPA and can lag a plant upgrade.
Source: CDC My Water's Fluoride (fluoridation status as reported by the Ohio Department of Health, fetched September 2026); EPA Safe Drinking Water Information System (SDWIS) treatment table; EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, entry-point fluoride samples.
How well the service area is mapped
EPA estimated the service area of Guilford Lake Estates with a computer model rather than drawing it from the utility's map, so its edges are approximate.
Source: EPA Service Area Boundaries; resident estimate by this atlas from ZIP-code overlap.
Photograph
On the map
Show this system's territory on the map — 1 ZIP code in all.
Sources
U.S. EPA SDWIS and Community Water System Service Area Boundaries (v3, 2026), Ohio EPA primacy data, 2020 census blocks: the system serving most residents, traced through purchases to the treating utility; Ohio EPA 2023 Sewer and Water Rate Survey (Ohio State, May 2025) for household bills; Ohio EPA DEFA loan awards since 2016 for the loans paragraph · EPA SDWIS · EPA service area boundaries · Ohio EPA drinking water · Ohio EPA rate survey
EPA's own record for this system: Enforcement and Compliance History report for OH1503412 (EPA ECHO).
Notable facts: data.epa.gov
Treatment: data.epa.gov
Supply stress: data.epa.gov
